Random accumulated links from twitter, especially @terrinakamura. No, I don't know what twitter is. No, I don't know what social media is. Yes, I cry for the future of mankind.

Twitter (get a free account) - need an email account for reference.

Twitanalyzer -evaluates your twitterness along several dimensions of "effectiveness".

Historical Follower Count - includes forecasting.

Tweet Effect - purports to analyze your comments and determine which comments increase/decrease followers. (I'm not sure that they can adequately account for lag.)

Foller Me - check out your followers, map them, find out where the live, stalk them; some of that anyway.

Busy Tweeter - nice GUI for quick overview of your tweeping activity.

TinyUrl - shortens URLS for tweets (others exist also).

Create Word Clouds - many, many cool options.

Safe Use Images via Google - avoid copyright issues.

Flash Tutorials - lots of complicated stuff the names of which I can't spell.

F My Life - character building beatdowns.