Jon Westfall of Pocket PC Thoughts has an intriguing review of Innobec’s SideWindow product for Windows Mobile devices. Essentially, you can utilize your handheld as a secondary monitor for your Windows desktop; it’s not quite Windows SideShow technology but it’s a slick way to get a wee bit more screen real estate. While you won’t gain the kind of productivity you would with an extra full-sized monitor, I could see this useful for apps that have a relatively small footprint like a VoIP client, digital audio player, or a chat application. For $15, it could be a nice addition if you need just a tad more screen. Be forwarned though: the application doesn’t list Windows Mobile 5 as officially supported even though it generally worked for Jon.