Ping.fm is a simple service that makes updating your social networks a snap. Update from anywhere using AIM, GTalk, iGoogle, WAP, iPhone, SMS and E-mail.

Service for tracking what URLs people are talking about on Twitter. Similar to Digg (people vote on an item and it gets displayed higher up the home page), but more to PageRank (basically every same final url, is considered a vote for that URL)

Suite of RSS services that teaches your feeds all kinds of new tricks. Seems to be interesting.