Not usually capitalized.

@@ -12,2 +12,2 @@
-<gloss>Post-impressionism</gloss>
-<gloss>Postimpressionism</gloss>
+<gloss>post-impressionism</gloss>
+<gloss>postimpressionism</gloss>

daijs, prog, rh, 情報・知識imidas, nikk, 新英和中辞典, eij, nipp

I guess the relevant tag would be [obs]olete, but not a single 
source I have access to except for Wikipedia makes any mention 
of it not being in current use. As a matter of fact, none of 
them use anything other than 後期印象派 (or 後期印象主義).

This is a strange term, because the literal meaning is "late period impressionism", which is not what "POST-
impressionism" is. Nevertheless, it became established and it's found in dictionaries. However, the Wp article 
suggests that it is now somewhat deprecated in favour of several other terms.
.
I suggest that 後期印象派 be labelled "deprecated" in this entry and that there be links to the other terms, none of 
which are in EDICT as yet, I think: 
印象後派
ポスト印象派
後印象派
.
The Wp article adopts ポスト印象派 for its title.
.
この呼称は、かつて白樺派によって日本に紹介された際、「後期印象派」と訳され、今日に至るまでこれが一般に用いられている（柳宗悦は「白樺」1912年1月号の
「革命の画家」では「後印象派」と訳した）。これは、まるで印象派の時代のうちの後期に属するものと連想させるが、しかし、postは、「～の後」を意味する接頭
辞であり、Post-Impressionism という語は、「印象派の後」ということを意味している。実際、Post-Impressionists（ポスト印象主義者たち）は、一方で
印象派の成果を受け入れつつ、他方では反対しながら、印象派を超克しようとした画家たちであって、「後期印象派」という訳語から連想されるような、「印象派の後
期」に属するものではない。近年ではこの訳語を避ける傾向も見られる。「ラファエル前派」という訳語に倣えば、「印象後派」とでも訳されるべきであるが、新案とし
ては「ポスト印象派」がもっとも受け入れられているようである。「後印象派」などとも訳されている。
http://ja.wikipedia.org/wiki/ポスト印象派
.
Alternative spelling
"Post-Impressionism (also spelled Postimpressionism[1]) is the term coined by the British artist and art critic 
Roger Fry in 1910 ..." [Wp]

@@ -13,0 +13,1 @@
+<gloss>Postimpressionism</gloss>

Meikyo vt and vi additions to n,vs entries
-*- via bulkupd.py -*-

@@ -12,0 +13 @@
+<pos>&vi;</pos>

prog

Thanks.

@@ -14,1 +14,2 @@
-<gloss>vying with</gloss>
+<gloss>rivalry</gloss>
+<gloss>vying (with)</gloss>

I changed "vieing with" to: vying with. The infinitive is: to 
vie with. That was an English mistake, not Japanese.

@@ -14,1 +14,1 @@
-<gloss>vieing with</gloss>
+<gloss>vying with</gloss>

I like the shorter "lit" version.

@@ -14 +14 @@
-<gloss g_type="lit">when you buy something cheap (of low quality), you still end up losing the money spent</gloss>
+<gloss g_type="lit">wasting money on a cheap item</gloss>

i agree with removing "penny wise and pound foolish", but isn't the literal translation "wasting money on a cheap item"?

could be treated as an id instead, it's a fine line.

@@ -14 +14 @@
-<gloss>penny wise and pound foolish</gloss>
+<gloss g_type="lit">when you buy something cheap (of low quality), you still end up losing the money spent</gloss>

daij

@@ -11,0 +12 @@
+<misc>&proverb;</misc>

Add POS to proverbs
-*- via bulkupd.py -*-

@@ -14,0 +15 @@
+<pos>&v5r-i;</pos>

There are currently 19 entries with the "proverb" tag, of which about half end with a verb. None have verb PoS tags. As I said earlier, I don't mind having them, but it's not a big issue, and prefer to be consistent.

isn't this somewhat different from English usage though? You 
can stitch together sentences in English with an "and", but 
in Japanese, you might use the -て form not to change the 
tense or mood but to add another sentence/clause. I mean, 
again, there are actual examples of this precise usage: "より
強い者（身分の高い者）が弱い者を虐げるが、上には上があって、その搾取と虐げの
構造がピラミッド状に続いている、というのです。"
http://www1a.biglobe.ne.jp/fujigaoka-
church/biblestudy/ecclesia5.7.19.html
It seems like a (small) waste to not pick up on that (for 
browser plugins like "rikaichan" etc.)

While I am quite relaxed about having a verb-ending proverb tagged with the verb class, I can see Rene's point. We can say " stitch in time saved nine" in an appropriate circumstance, but we'd never decalre it to be something that is usually conjugated.
I think it's safest and cleanest to drop the verb type.

@@ -15,1 +15,0 @@
-<pos>&v5r-i;</pos>

Not sure why conjugating a proverb would make it less of a 
proverb. 
proverb - 
"a short pithy saying in general use, stating a general 
truth or piece of advice."
"a short, memorable, and often highly condensed saying 
embodying, esp with bold imagery, some commonplace fact or 
experience"
http://www.thefreedictionary.com/proverb
the imagery is still the same, the commonplace fact/piece of 
advice is the same, the proverb is still recognizable.

http://eow.alc.co.jp/search?q=フェスティバル&ref=sa

AFAIK, not limited to music as the amendment suggests. i understand the distinction you're trying to draw, but i think it's fine to leave it just as 'festival'.  perhaps 'festival (esp. music, film, etc.)'  in any case, it should match the entry for フェスティバル

@@ -11,1 +11,1 @@
-<gloss>(music) festival</gloss>
+<gloss>festival (esp. music, film, etc.)</gloss>

as opposed to traditional Japanese festivals, etc.

@@ -11,1 +11,1 @@
-<gloss>festival</gloss>
+<gloss>(music) festival</gloss>

daijs

I think it's OK as is.

@@ -22,1 +22,2 @@
-<gloss>to stand out</gloss>
+<gloss>to be (something) very much</gloss>
+<gloss>to be an extreme (something)</gloss>

reopen.  is this the best possible gloss?  should it be glossed as a verb or as an adj-f?

approve for now because it has been removed from its original entry

http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1164647476
"「ドがつくほど」という言葉を見かけることがあります。"
_
http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q11112717876
"ドがつくほどドMです！ 悩んでます！"
_
http://dic.pixiv.net/no_article/ドがつくほど素�%B
A%BA
ドがつくほど素人
_
https://twitter.com/akko_chan_movie/status/238659110365696000
「ド！」がつくほどの仕事に対する生真面目さ、必死さでした。
_
ngram 
ドが付く	1869
ドがつく	2970
ドがつくほど	1082
ドが付くほど	622

ドがつくほど
"(I'm) so much X that you could add the prefix ド to it"
so I guess ドがつく would be
"very much", "extremely"

daijs

google images

yeah, maybe. I was aiming for a less literal, more natural 
translation - in English, Fuji Rock for example would be 
called a "music festival" rather than an "outdoor festival".

surely it is the 'music' that belongs in parentheses, no?

@@ -12,0 +12,1 @@
+<xref type="see" seq="2800930">野外フェスティバル</xref>

daijs
way more common than the non-abbreviated form:
ngrams
野外フェス	141088
野外フェスティバル	8134