There's not much to this one, but I thought I'd post it anyway.
In Xbox Live News, Major Nelson posted news of a new Live update which adds support for wireless guitars for Guitar Hero and Rock Band (and whatever other guitar/music games that end up using them). This comes at the heel of impressions of Guitar Hero 3's Wireless guitar.
360 owners might be dissapointed it doesn't do more, but you'll be happier when your wireless guitar works. Major Nelso also mentions that a more substantial update is said to be in the works and will go live later this year.