Over the years, as new web services have come into prominence, there’s been a rush to get hold of the best IDs. Most people would chase something resembling their name, with those with popular names too late to the game being left with the lame IDs: nicknames, real name + licence plate number, or hackerz sp34k versions.
Some of the defunct web sites I got good IDs for include Excite and mail.com. Some I still use include Gmail (and all the other Google properties), Hotmail and Yahoo.
OpenID identifies you by a URL/URI, so it’s marginally less user-friendly than a conventional logon, but if it takes off (*if*) and gets widespread use around the web, from a user point of view, it could go a long way towards cutting down on the zillions of passwords people currently have to remember… and thus have to write them all down.