Another notch on the MicroID belt.
You can see it in action in the head of any page with the pattern http://NICKNAME.myplaxo.com/.
Plaxo will create and publish a MicroID for each of your verified email addresses in your account. You need to visit your settings page and claim your NICKNAME.
When you come back to your claimID account and claim your Plaxo profile page, it will be put in the verification queue automatically. Please note that since MicroIDs work with math done on URLs and identifiers, the URLs must be exactly correct. Please make sure that your myplaxo.com URL has a trailing slash when you enter it at claimID. (This also goes for the links pointing to Last.fm).
Another small step to taking over the world. We should congratulate ourselves.