Plurk could add all Twitter IDs:Twit users claim their equiv Plurk ID by twitting a Plurk-supplied rand string. Plurk verifies, gives access
twitter would have serious objections to that plan
does Twitter own people's user names? A tool to let people import their friends' user names into Plurk should be ok. Objections, yes...
nuthatch... some turkey took it on twitter. I win with the .com and .gmail though