extracting coefficient standard errors

Does anyone happen to know a more elegant/robust way
to extract the (approximate) standard errors of fixed
effect parameters than

vcov(mm)@factors$correlation at sd

  ?

Ben Bolker
Associate professor, Biology Dep't, Univ. of Florida
bolker at ufl.edu / www.zoology.ufl.edu/bolker
GPG key: www.zoology.ufl.edu/bolker/benbolker-publickey.asc