The 140dev Twitter Framework is a free source code library containing a Twitter database server for gathering tweets for selected keywords, as well as a display plugin that lets you show tweets from the database in a single line of PHP code.
What is everyone searching for or talking about? Knowing the terms that are trending right now is like knowing the news. With a new API your apps can be just as aware. Lets Be Trends provides programmatic access to the most popular keywords on Twitter in realtime (details at our Let's Be Trends API profile).
The upcoming Chirp conference organized by Twitter is bound to interest a new group of developers. Getting up to speed with a new API can take some research, but Twitter makes it easy with a handy list.