Binary package hint: compiz
In maverick I was using compiz with edge flipping with the mouse a lot. This will be done in the compizconfig-settings-manager via Desktop Wall. There's a tab with Edge Flipping. In natty I am using the classic gnome system because with unity this is not possible anymore (at least it's very painful). So I switched to classic, switched on edge flipping for Pointer and Move and the result is: you can always switch virtual desktops while moving a window from desktop to desktop. But going with the mouse pointer to the screen edges works some times and after a while (some desktop switchings, sometimes even only one) it doesn't work anymore until I start moving a window over the edges. I tested this on NVidia and ATI graphics cards. The problem is the same. I know, when gnome3 comes everything is different. I guess in that case I'll change the window manager. But until then I'd like to have this bug fixed.
Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 727104, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.