Do you love the taskbar thumbnails in Windows 7, but think they show up a bit too slow? I did, so I did some research and found a way to change the delay.
It requires a change in your registry, which you can do by creating a file with the following text:
Save it as for example MouseHoverTime.reg, and then run it by double-clicking on it.
If you want other hover times I think you can just change the number 0 to something else. Think the number is the amount of milliseconds between you hover over it and the thumbnail pops up.