Two relatively new websites that I can’t live without.
Songza
Songza puts every other online music service to shame. It’s of questionable legal nature, but poses no risk to end users. Songza indexes the web for unprotected MP3s and lets the user play them in an extremely elegant flash interface. It’s not possible to download the music, but it’s great when you want to play a particular song, or demo a song in it’s entirety before buying from iTunes or the like. Perfect for finding that one song to play during the party also.
TripIt
TripIt lets you forward any confirmation email from dozens of travel sites and automatically extracts all the important elements and organizes it neatly. For someone who travels a lot, it’s invaluable — lets you forward airline, rental car, and hotel confirmations and have it organized by date elegantly.