Wow this is cool. I just discovered/started customizing it. Its pretty badass. I now have a really cool/badass CPU meter(s) as well as MG.org RSS feed, and my most recent 8 emails on my home screen. I have it set so the Gmail only shows new messages when I hover my cursor over it. It does use a bit more of my CPU than expected, but it is mainly coming from the clock, all the little lines around it rotate(this is an downloaded skin as well)
You can download the program at Rainmeter.net and if you want the skin I have, it is located at Rainmeter Skins - Circular by Bazerka - Customize.org . Still figuring out everything, I've only had it for about 20 minutes now, but this is Almost as cool as when I first discovered Rocketdocks.
Looks pretty cool, I'll have to check it out.