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Someone did Gérard in the meantime.
@jc: I merged them.
@RBega: Done.
@Tobias Fritz: Done.
@Will: done
@Andrés: done
@Dennis and joel: done.
@Jay: done.
Two Matthias Krecks:
http://mathoverflow.net/users/4343/matthias-kreck
http://mathoverflow.net/users/27783/matthias-kreck
Michael, done!
Teo, done.
Sayan, do you want to keep 13739 or 30703?
@Asaf: I've merged the two Gérard Langs.
Something I've belatedly remembered (an oversight from the Old Days): 637 should be merged into 763. (Shame to spoil the numerical coincidence, though.)
@Yemon: done.
@rafaelm: done.
Registered user 31541 is Jim Stasheff, whose main account is 16682. He didn't understand why she showed up as 'unknown' when he asked a question yesterday; could these accounts be merged?
Oh, 'he' of course.
Todd, done.
dburde, done.
It might be a good idea to merge http://mathoverflow.net/users/16688/doron-zeilberger and http://mathoverflow.net/users/5822/doron-zeilberger (both unregistered) although I don't know if he has additional unregistered accounts
@Andres, @michor, @Joel and @motl737, all done.
@Asaf, done.
Fred Daniel Kline: This thread is for merging users on mathoverflow.net (the main site), not meta.mathoverflow.net (this site).
Asaf: I merged the users, but since neither account was registered, it is not a long-term solution.