Annoyed by the fact that you have to use your Android’s tiny (on-screen) keyboard to type your text messages? I was. Until I found SmartDog’s Android Desktop app. I think it was called “A Web Desktop” or similar in the app store. It runs a web server that you can connect to from your desktop, and send and receive text messages, synchronise the clipboard, and upload/download files from to your phone. Very cool!
Edit: (2010-01-19) This application is now called “Remote Web Desktop”.