I follow a lot of people on Twitter, normally I use the web interface.  I used to follow a lot more, but a few months ago, I organized my follows into lists.  I ran into two problems, I ran out of lists quickly (I had far more than 20 categories to fill).  The problem is, now I'm not as diligent about opening up the lists and seeing the activity.What web application options do I have in the cloud for keeping better track of my Twitter account?  Ideally, I'd love a way to filter list activity in real time (so if I enter pizza and either @pizzaman tweeted or someone tweeted about pizza, it would show up).I realize that this could be perceived as a bit open ended, but despite searching through many options, I find a lot of lists of apps don't have ones with features that I'm looking for, and many are fly-by-night kind of things.  Most recently, I've tried HootSuite, but it seems to have more features if I want to keep track of my followers, rather than the people I follow.  I've tried other non-web apps in the past like Tweetdeck, but it didn't seem to do everything I wanted.I'm definitely not asking someone to do the legwork for me, but I'd appreciate any recommendations. 
Organizing and filtering Twitter data
twitter;webapp rec;follow
Create a RSS feed for your Twitter List using this service -http://zeyne.net/rss.php?url=twitter.com/{username}/{List name} (replace the actual username & List name within the placeholders)Subscribe to the generated feed with Google Reader. Within Google Reader, you can then search for keywords within tweets from your Lists using Google Reader's Search feature.