Quotably - now you can piece together a Twitter conversation as a threaded discussion, see this example…closest thing to this we have had so far is Twitter Digest.
To get an RSS feed of a users conversations, just whack a “.rss” at the end of the URL,
Twitzer - from the ShortText edge feed service is a hack that enables you to post more than 140 characters… the remaining text is kept in a URL at ShortText.
Twitsig - a Twitter image signature for your email, forums, etc…
serendipiTwitterous - enter a Twitter user or hashtag, and it will scan the tweets for conceptual terms and lists these terms, then it goes and does a search with these terms and gives you the top hit at Yahoo!, Slideshare, YouTube, etc…
[via OUseful Info]
17 tools to visualise Twitter