UPDATE (2011/11/02): Feed folders are now supported, too! Thanks @nfm.
Recently, I realized that I was subscribing to too many RSS feeds, and the volume of posts between them was so varied that my reader was largely dominated by a few sources and the other, smaller sources were being completely overshadowed.
Because of this, I've recently found myself more religiously following my Twitter feed, where authors are more likely to be able to post small updates rather than a few sources constantly posting large ones. — I began to wonder why everything couldn't just be on my Twitter, instead?
So, I've built the “Twitter Migration & Networking Tool” (or TMNT, for short) in order to help you migrate from Google Reader to a more Twitter-focused setup. — It works by analyzing your feed reader's exported *.OPML file (of subscriptions), and allowing you to manually choose from associated Twitter feeds for each website, and follow them! …Cut the fluff, and remove outdated subscriptions as well in one simple step.
I'm exhausted after coding this in a sprint, but hopefully there are no bugs. Check it out!