According to this list (http://www.kffl.com/static/nfl/features/freeagents/fa.php?option=By+Team&y=2008), UFAs are:
Grossman
Berrian
Gilmore
R. Brown
Ayenbadejo
McClover
Ayenbadejo is worth keeping for special teams alone. I'd like to keep Berrian, but I have no idea what his value in the open market is. The rest can go as far as I'm concerned.
I would have no problem dropping Miller and Archuleta. Bradley's been disappointing, but I don't know that he's making enough that dropping him is worthwhile. If you bring back Berrian and maybe pick up another decent WR, I'd be OK letting Moose go, but our WR corps isn't great as it is.