You might have noticed a couple of new Google Labs features available in Gmail. If you have your Google Labs tab enabled, you can go there, scroll to the bottom, and check the new Google Gadget-related features out. Now you can get a Calendar view or a Docs view via Gadgets right within your Gmail, or specify any Gadget URL as well. Google moves so fast sometimes it is hard to keep up. Nice to have the new features, though!