iTunes 8 was announced this morning as part of the whole Let’s Rock Apple announcement festivities, and there were a few nice pieces of news. First, NBC is back on iTunes with shows like The Office, 30 Rock, and Ballestar Galactics. What’s more, though, is that iTunes will now be selling TV shows in high definition. Aside from the feeling that I know my wallet is about to be drained, this is a very welcome addition. My only hope is that they allow those of us who have purchased shows in SD to “upgrade” to the HD versions at a discount. It’s only fair, right?

In other news, Apple has added “Genius” to iTunes - that being a recommendation engine that looks at the track you are listening to, and recommends other tracks in the iTunes store that it believes you would like. In addition, Genius can also create truly customized playlists on the fly, again, just by sampling what you are listening to. It will pull other songs from your iTunes library that it believes would complement your selection, without any work to be done on your part. We must admit, it looks slick. Speaking of which, they’ve also included a new visualizer, which is just off the hook. You’ve gotta see it to believe it.

iTunes 8 is available now.