One other thing to consider during the upgrade is how you rollback in the case that you run into some serious bug w/ v6. With the in-place upgrade you need to restore the TSM database before you're back in business (I've done this before - it works, but is a little harrowing). If you bring up a new server alongside your old server, all you have to do is switch clients to use the old server while you work on the new server.
-- -- Skylar Thompson (skyl...@u.washington.edu) -- Genome Sciences Department, System Administrator -- Foege Building S046, (206)-685-7354 -- University of Washington School of Medicine