If you want to monitor your WoW realm and WoW guild, get this free Windows 7 WoW gadget!
Monitor your realm & guild
The gadget will show your realm status and guild statistics and add armory links as well. It works flawlessly with Windows Vista and Windows 7 and supports European and US servers.
Localized: English, French, German, Spanish and Russian
As intended, this shows the real status and nothing else, so it’s rather simple. For more complex gadget you should visit some WoW sites or ask your guild members for other stuff you can use to track things