Well, this week atebits announced that they were releasing tweetie2. Now, being a sad geek, i use twitter quite a lot. Admittedly, until recently this was more to do with monitter.com than with anything else, but twitter is slowly becoming a social destination for me as well.
However, in the same vein as why i originally built monitter.com - I see twitter search as a still under utilised potential for networking. What i'd like to see is a twitter application that allows me to merge my saved searches and my follows into one timeline. I use my desktop tweetie like a news radar, it's how i know what's going on.. but what i'd like is to be able to queue up a bunch of saved searches as well, and have them injected into my main timeline - simple really.