You can delete any of the Motoblur widgets off your phone's home screens if you don't want to see them there, just like you can delete any other app icon or widget (long press until a short vibrate, and you'll see a trash can appear where the application drawer normally is to drag and drop the icon or widget into). However, this doesn't uninstall it. It just gets it off the desktop.
I've found you can also log yourself out of most of the accounts (Facebook, Twitter, etc.) that Motoblur uses if you're using apps for those things. I got sick of seeing Facebook notifications showing up in three places ? e-mail, Facebook app, and Motoblur ? so I finally logged out of Facebook in Motoblur. Problem solved. The app is much nicer anyway, and does a lot more.
In my opinion Motoblur is a fairly decent idea in theory, but it was executed in such a way that it's very amateurish. That's fine if you're a low-end user. Some of us want a lot more out of our devices, and I've found myself using full-featured apps a lot more than Motoblur's various widgets and apps. If I could uninstall Motoblur completely I would in a heartbeat.
But, I guess it really doesn't matter now. I ordered a Nexus One today and the Cliq will be on eBay by week's end.