[BioC] Supressing welcome to bioconductor message?

[Jeff Gentry]

I could have sworn that I've seen this before, but my google-fu is failing
me at the moment.  How can I suppress the "Welcome to
Bioconductor" message when BioC loads?

I'm trying to develop a module for GenePattern which uses
(indirectly) Biobase - but GP spits out a stderr.txt file which really
seems to be both stderr & stdout ... it's confusing to folks who don't
understand that it's not actually an error.

Thanks
-J