I've been using 64-bit Windows & on my laptop for a couple of weeks now and I'm pretty happy with it. I was very happy with my Windows 2008 Server install, but I finally took the plunge to pave my laptop with WIndows 7.
I found a little trick today that will get me around something that was annoying me since I installed. If you use the task bar buttons to launch a program (like where your quick launch menu would be), if you click it again, it does NOT open a second instance of the program, even though that might be what you wanted to do.
For instance, I have a project open in Visual Studio 2008 and I want to open a second VS2008 instance to read some code in another project. clicking on the task bar launcher, like you would with your quick launch menu, simply sets focus to the instance that is already open.
In order to open a second instance, you have to shift+click the task bar launcher. This will open a second instance.
Hope this helps someone.
~Lee