Get mobile access to your iTunes library with nuTsie
nuTsie is a music client that streams in your iTunes library. Well, as our friends at EngadgetMobile have pointed out, the nuTsie system actually reads the names of your tracks and matches them to whats on nuTsie's server. With this in mind, your main computer does not have to be left on, and the nuTsie application does not require you to upload music anywhere. All you have to do to get started is upload your iTunes Library.xml file to nuTsie's server under your account.
Performance for this service is said to be pretty good, with extremely good connection speeds. Just watch out when you close your clamshell phone, some have been reported to shut the nuTsie applications right off. The service is free to use during the public beta period, but the list of compatible mobile devices is pretty slim at the moment.