Apple has also done away with the shopping cart; the only way to buy content in iTunes 9 is One-Click purchasing. If you were one of the many people who used the shopping cart as a sort of "wish list," not to worry--iTunes 9 now includes a dedicated wish list feature. Click on the arrow next to a Buy button and choose Add To Wish List, and that item is added to your list for later consideration or purchasing. You can access your wish list from the Quick Links section on the iTunes Store home page (where it conveniently notes how many items are on the list), or at the bottom of any other page in the store. One limitation, however, is that not all items can be added to your wish list; for example, I noticed I couldn't add some iTunes Passes.

Finally, there are two new types of content you can purchase from the iTunes Store: iTunes LPs and iTunes Extras. iTunes LPs are the music industry's latest attempt to get people to purchase albums instead of individual tracks. Each iTunes LP includes the album's full track list, along with full-screen extras--designed with input from the actual artists--such as music videos, video interviews, liner notes, discographies, and lyrics. They're a fun option for hardcore fans, even though in many ways they remind me of the music-focused CD-ROMs of the '90s (though with better quality multimedia).

Unfortunately, there aren't many iTunes LPs available right now--just 11 albums (five of those pre-orders) and one "comic book and single"--and you pay a premium for them: The iTunes LP version of Dave Matthews Band's latest, , is $20, and The Grateful Dead's is $14 (compared to $10 for the standard version). And the tracks themselves are the same 256kbps AAC files you get with the standard versions; for many music lovers, it would be easier to justify the premium if iTunes LP also included higher-quality files.

iTunes Extras are similar to the special features--deleted scenes, interviews, and the like--you get with many DVDs, and are now included with select (currently 14) movies from the iTunes Store. The absence of these features has kept many movie buffs from purchasing movies from the iTunes Store. I purchased and enjoyed these extras, which play in the iTunes window and include "live" tours of set pieces and places, storybooks, making-of clips, videos inspired by the movie, robot schematics, set fly-throughs, deleted scenes, and a useful chapter menu. Unlike iTunes LPs, there's no big price premium here: movies with iTunes Extras appear to be the same price as the movie alone sold for previously. For example, Wall-E is $15, and is $10. Note that these Extras won't play on your iPod, iPhone, or Apple TV.

There doesn't appear to be a way to upgrade to the iTunes LP version of an album or the iTunes Extras version of a movie if you've purchased the standard versions of those albums or movies in the past.