This is such an awesome post - so many excellent ideas and tools! Thanks Jeff!

SocialMention has a great embeddable widget where you can follow mentions of a specific keyword across all types of social media, including microblogs, social networks, social bookmarking sites, and video sites.

Tweetwally is a pretty cool way to agreggate tweets onto a real-time streaming "wall" that can also be formatted for projection screens - so you can set up a Twitter backchannel at a session, or put digital screens around the venue displaying your tweet wall.