Interesting editorial from MobilitySite today talking about how possibly iTunes can be streamed to your phone and I would think the Treo in this case, now not directly but through the means of Slingplayer which is pretty cool if you ask me.
"With the release of Apple TV, C/Net reports about an intriguing new possibility: streaming music from iTunes on your home computer to your cell phone. No, Apple TV does not stream over the Internet or across a cellular phone network, but the SlingBox does. And Sling Media, the maker of the SlingBox, confirmed to CNET News.com on Monday that the company is working on making the Slingbox compatible with Apple TV. The most likely--and compelling--scenario would be to allow the streaming of Apple TV content (which is synched with a PC) to a mobile device."
MobilitySite