My first iPhone app, TwitterTrak for the iPhone. Do you want to keep track of what people on Twitter are up to from your iPhone? I wrote this one first because it would be relatively simple, and because I wanted it for myself. :)
TwitterTrak will let you keep up on any topic, person, or keyword you choose. Just set the search term, and it will gather the tweets for you.
Ideas for additional features? Please leave comments and let me know. I really want to hear what people want most, but keep in mind, TwitterTrak will always be a tracker and search tool first and foremost.