I'm not aware of any new info... I expect we'll see Blackberry later this year, perhaps in conjunction with RIM's firmware updates. A comment by a Sling VP a few weeks ago suggested an iPhone client would be more likely in 2009, though maybe they'll accelerate development - how could you not with all the hype?

Slingbox SOLO w/ ASUS Wireless Bridge streaming TiVo Series3
Zatz Not Funny!