I found this link earlier today for Windows 7 tricks: 20 top tips and tweaks from Computerworld.
Most of the time I don't find these tips useful, however this time I did find a few:
1. Use hidden international wallpapers and themes. By browsing to C:\Windows\Globalization\MCT any Windows 7 user can find hidden international themes. Instead of installing the individual themes from Great Britain, Canada, South Africa, Australia, etc. I just copied the images to a new folder called "International" and created my own theme.
2. Power efficiency report. This hidden tool built into Windows 7 was very cool. I ran it on my laptop which has Windows 7 Ultimate and now I just need to interpret the results and make advanced changes to my power options.
3. Added Search the Internet to the Start Menu. Vista had this set by default but Windows 7 doesn't. I knew it was in the Group Editor so this just reminded me to make the change. Go to the Group Policy Editor (gpedit.msc), User Configuration > Administrative Templates > Start Menu and Taskbar > and then activate "Add Search Internet link to Start Menu".
4. Speeding up the display of thumbnails on the taskbar. This was another cool little tweak only now made in the registry - more for looks than anything else. Launch the Registry Editor (regedit), go to HKEY_CURRENT_USER\Control Panel\Mouse, double click MouseHoverTime and change the default value to less than the default 400 milliseconds.