Twitter needs archiving and timeline search

The constant stream of statuses and updates are overwhelming at times, but some of them are important. Marshall Kirkpatrick writes that Twitter is indeed saving all of our tweets, but we can't access them. In fact, the Twitter API only allows you to ring up a users latest 3200 updates.

When will Twitter allow us to access our old content, or at least search it? Imagine that you wanted to go back in time and see what people were talking about when Barack Obama was being sworn in? What if you missed last night's football game, and you wanted to dial back Twitter to the time when your team was about to score the winning touchdown?

I love Twitter's search capabilities, but they need to improve it and make it more usable. I hope they take all of this into account spatially too, when the Geolocation API is ready.