Roundup : Who Follows You, Set up your Twitter list, Twply, Mr Tweet, Twitter-to-FriendFeed Contact Sync
Who Follows You - FF plugin to visually be aware of people who follow you back on Twitter
Set up your Twitter list - create a mobile-friendly list of your favorite twitters, similar to Twapper.
Twply - your @replies are forwarded to Email inbox, also see Twitter Reply, and Replies by Twitapps.
Mr Tweet - looks through your extended network to help you build effective relationships…just follow MrTweet and you will be sent a DM with a link to your report [via NW]
Twitter-to-FriendFeed Contact Sync - see which of your Twitter friends are on Friendfeed and vice versa [via WW]
BONUS
Twoogie - Twitter Doogie Howser style
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