Software products that you think are really good

[Boris]

List some software that you think rocks. It can be any application, music, email, enterprise stuff. You name it. If you have time describe why you like it.

I'll start.
Rhapsody's music service - Granted I havn't compared it to competing products, but it offers a wide variety of music on a subscription basis. It also offers a device that creates a fairly seamless integration from music selection to portable listening.

YouTube - the site has gone downhill a bit but I still like the crazy variety of video and the ease with which other websites can publish YouTube videos.