The 1st article which explains the value of Twitter to me
A short and very valuable article from a guy who just arrived at "ten thousand tweets on twitter". He should know what he is talking about :-)
From the page: "it's (Twitter is) a really great tool to see what's going on, in fact so great that I no longer feel the need to read as many RSS feeds or listen to as many podcasts, simply because I'm participating in the conversations before they become even blog news."