Muziic is a new music web app based on YouTube music videos, you can make your own playlists, listen to a whole album, there is even a desk top app for windows, all of those with no kind of any limitations, no copy rights issues involved (At least until now), no big record labels making a fuss.Muziic is the work of a 15 year old teenager ,David Nelson, which makes it quite impressive. But from my point of view the best feature is not having to access the web from the U.S. or Europe, music or video likeHulu, Pandora and Vevo (a new service, smiler to Muziic, a YouTube and the record labels cooperation) are restricted to the U.S. and BBC iPlayer and Spotify are restricted to the U.K. and Europe. It's nice having a service that works out side the U.S., the U.K. or Europe. You can always use a proxy server, but it doesn't always work and it's a big headache.
Another new web app is Seesmic it's a new twitter client very smiler to TwitDeck but wokrs on a web browser, no installations needed. It has all the basic functions that all Twitter clients posses.
One more site is Give away of the day, every day you can download an application, the download is a full licensed version and not a trial or limited edition.