The folks at SlingMedia have been working hard on coming up with a SlingPlayer Mobile client for the iPhone and have come up with a proof of concept running on a jailbroken iPhone while they await Apple's stamp of approval. Looks like the folks at Engadget got an early look at it and posted up about it here. Dave Zatz also has some pictures of it in action here.
If you are attending Apple's WWDC. Sling Media's Product Manager Vicky Shum will be close by hanging out at the Starbucks at 120 4th Street, San Francisco (right across from the Metreon) between 10:00 and 16:00 (10am and 4pm) on Monday, June 9th. So if you'll be in town attending WWDC, please stop by for an SPM demo you won't be disappointed. :)