Devices supporting Vista's SideShow functionality aren't exactly flowing like water yet (seriously, when's the last time you saw someone sporting a W5Fe?), though that's not necessarily for a lack of interest. The functionality's plenty cool, it's just not really an overnight job getting enough manufacturers on board to support the concept and transform the consumer electronics landscape into a Vista-interfacing armada of small screens. If you had to boil it all down to exactly two things Microsoft could do to take SideShow from an ultra-niche market to ubiquity, though, let's be honest: they'd have to be to add Windows Mobile and iPhone support. Indeed, official WinMo support is a standing rumor, but in the meantime you can grab Ikanos Consulting's Go Gadgets beta, which supports installation and control of SideShow gadgets over pretty much any form of mobile connectivity you can throw at it. Turns out these guys have been hard at work making a general HTML renderer for gadgets, too, and have specialized it to look snappy on mobile Safari -- hence the iPhone and iPod touch support. This one isn't quite ready for public consumption yet, but if WinMo's how you roll, you can sign up for the beta now.
Read - SideShow on the iPhone
Read - Go Gadgets for Windows Mobile