GoogleWave question

(crossposted)
So, I got this invite, because I looked over googlewave's stuff many months back and it looked promising.

Now I've clicked the link to start a wave account.... and my username ('betonica') is taken. I'm betting it's taken by me, somewhere in google-world.  There seem to be others who have had this problem (there's a "Problems setting up account and integration with Google Account" thread in their support forum... with no answers from anyone at google).  

Any of you net-geniuses know what I should do?  I'd rather not have a different name over there.

Thanks in advance.