Davey did come in with a good point, which I suspect is more the gripe than anything to do with what tuning the guitars are in, that changing tunings is a royal pain in the arse (especially if you use the same guitar in more than one band, too).
We just tune to "Drop A", which is A-E-A-D-F#-B by my definition. Everything we play is in that, the bassist has a 5-string so if I were to use another guitar, we could just as easily play in standard E tuning, but given that we have nothing which benefits from that, what's the point? :)
I don't see the point in changing tunings. Pick one and stick with it! (I guess dropping the bottom string a tone and bringing it back up is okay, but that's as far as I'd go). My guitar is set up to be in a given tuning with a given gauge string. Why on earth would I want to ruin the setup by tuning it differently!? :)
Roo