It appears that, along with some other nice updates to Google Trends, they’ve added support for comparing web sites by top level domain name.

Some trends to watch:

apple.com vs. mac.com vs. me.com

textpattern.com vs. expressionengine.com vs. wordpress.com

[Via AURUM3 NewTech]

Update: Link updated from the Google Trends blog to the Google Webmaster Central blog which has the specifics on this particular new feature.