Easier ways to create .Rd files?

R-helpers:

Are there any ways to auto-generate R-friendly (e.g. will pass a
compilation check) .Rd files given a set of .R code?  How about GUIs
that help properly format the .Rd files?  Thanks!  I want a basic set
of .Rd files that I can update as I go, but as with most things my
documentation typically lags behind my coding by a few days.

--j