For my own use, feel free to add your favorite Windows 7 tweaks.  

Driver for printer:

http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?prodNameId=33996&lang=en&cc=us&prodTypeId=18972&prodSeriesId=28856&taskId=135

Compatibility issues:

http://www.pcworld.com/article/183455/overcome_windows_7_softwarecompatibility_issues.html

http://www.makeuseof.com/tag/common-windows-7-compatibility-issues/

Tweaks:

http://www.maximumpc.com/article/features/20_windows_7_tweaks_tips_%E2%80%93_every_secret_uncovered_date

http://www.howtogeek.com/howto/5391/175-windows-7-tweaks-tips-and-how-to-articles/

http://www.tweakwin7.com/

(Lots more under "windows 7 tweaks")

UI tweaks

http://www.thewindowsclub.com/ultimate-windows-tweaker-v2-a-tweak-ui-for-windows-7-vista

http://wingeek.com/blogs/stevesinchak/315/356/windows-7-user-interface-tweaks/

http://www.downloadsquad.com/2009/05/29/7-free-windows-7-tweaking-utilities/

http://blog.unlockforus.org/2010/01/winbubbles-2010-customize-and-tweak.html