For those of us who have studied Japanese to a pretty advanced level, a big problem is idiomatic phrases. Even though we understand every word in a sentence, we might not understand the sentence at all because words are being used in an "odd" way. Most of the time, this is because the sentence contains an idiomatic set-phrase.

Watching My Boss My Hero in Japanese, i encountered the sentence:
向こうは腐るほど金を持っている香港一の成金マフィアだ。

While I could see every word in the sentence and understood all the grammar, 腐るほど金 made little sense to me. "A rotting amount of money". I could GUESS the idiomatic meaning, but I wanted to be sure. Using google I found the point of this whole post:

http://www.geocities.jp/tomomi965/index2.html

A japanese dictionary of idiomatic phrases! If you go into く for example, you can find 腐るほど and there's a LOT more. Seems like a great source, both for help when translating and as a mining spot for interesting definitions.

EDIT: It should be noted that sanseido contains this idiomatic phrase under 腐る, but that doesn't make the site any less useful

Cool site!
Actually I had it in my bookmarks already but had totally forgotten about it. Thanks for bringing it up!

While I'm nowhere near ready for it, I'm glad to have that link for when I am.

o lord have mercy...ありがとうございます！