PicFog

PicFog – real time image search.

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TwiPho

TwiPho – searches image hosting sites such as TwitPic, img.ly and yfrog.

Twidentify

Twidentify – search engine that sorts results by people who get retweeted the most.

Twitter Venn

Twitter Venn – enter 2 or 3 search terms and see results displayed in a pretty Venn.

Twithority

Twithority – search engine that ranks results by ‘authority’. Results are displayed by rank and time.

twitority

twitority – “authority based Twitter search”.

Twilert

Twilert – sign up for email alerts of tweets containing the keywords you specify. Of course you could just use Twitter Search and pinch the RSS.