Smoking gun

smoking gun
煙が出ている銃

Example:
Comments are dead. Twitter holds the smoking gun.
日本語出てこない。

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(Quote by Dana Oshiro from ReadWriteWeb)

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smoking gun
決定的証拠

Example:
We never did find a smoking gun in Iraq.
イラクに決定的証拠を結局見つからなかったな。

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Comment:
The term smoking gun was used a lot by the media in the run up to the Iraq invasion.

Listen up

listen up
よく聞く

Example:
Listen up. I'm going to announce the results now.
よく聞けよ。これから結果を発表します。

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Comment:
This phrase is really only used as a command, as in the above example.

Idioms

Found this cool page at http://www.listen-it.com/ It focuses on English idioms, so it may be a little difficult, but the explanations are really good, so I highly recommend checking it out.

Guess What

guess what?
ちょっと聞いて

Example:
Hey, guess what? I finally updated my blog.
ねえ、聞いて聞いて。やっとブログを更新した。

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guess what?
どうなったと思う?

Example:
I walked into Starbucks and guess what? The professor was there sipping down a latte.
スターバックスに入って何だと思う？先生はそこにラッテをすすていた。

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Comment:
Guess what is a casual phrase probably used to make a friend seem involved in an otherwise boring story.