In Snow Leopard the keyboard hangs occasionally when changing spaces. Sometimes for only a few seconds, sometimes forever. All sorts of people are talking or reporting about this issue.

Why isn't it being fixed? Hallo there, Apple? Are you there?

There are currently about 100 posts in the Apple support thread dating back from Sep 15, 2009. You know whats annoying? Killing your Dock constantly while you are working.

Apple: SrSLy 4real. Fix this. Its equivalent to working really hard and someone smacking you in the forehead randomly. It kinda sucks, and its really irritating.

(Note: My keyboard only hung once during this post).

Update: March 3, 2010

After some further research, at least for me and a few others, this bug is tied to an application called Cinch. If you have Cinch installed, try uninstalling it and seeing if this problem goes away. A pretty useful app, but I'd rather resize my windows manually than 'get interrupted' when I'm in my workflow.

I uninstalled Cinch 5 days ago, and the problem has gone away for me. I was having my keyboard hang 4 or 5 times a day with it installed.