I'm trying IE9 and I have pinned the SO site (well, questions tagged as PowerShell) to my Windows 7 Taskbar. What I would really love to see and I don't know if this is possible, is some sort of a taskbar icon overlay indicating new questions posted since my last visit/refresh. Ideally the icon overlay would indicate the number of new questions but that might not be possible. Perhaps it might work like an IE RSS subscription and flag the icon when there is something new. It is quite likely that this would require support from IE9. I think I'll also post a suggestion with Microsoft.
Just looking at the IEBLog and I see this comment:
Sites can also program notifications when the user pins them in the task bar.
So this looks like it is possible. Unfortunately it looks like IE9 and this post editor aren't quite getting along. :-(
Update: found this in a feature list for IE9:
Icon overlays. Icon overlays are available on Windows 7 taskbar for pinned sites and provide an indication of personalized website specific status such as number of new messages.