Is there some documentation on the various Windows 7 registry settings,
preferably from Microsoft or in some kind of Wiki?
E.g., what settings exist for the Taskbar, Start Menu, Explorer, etc?
I've found some 'tweak' sites but they usually only offer information for a few features and even that is mostly hidden in reg files and poorly documented.
Best Answer
As Harrymc pointed out, you're not going to get every key, but Microsoft does actually offer quite a bit of info on the registry and it's all on support.microsoft.com. Not exactly sure what you're looking for, but you may just be able to find it there.
Head over to there, and type "REG: entries" in to the Bing search box and hit enter.
You'll get like 5000 results, many like these:
So you've got lots of reading material available. ;)