André Gulliksen said:
Actually, I started to respond to the OP, but then realised that he
probably wasn't talking about boot managers as traditionally understood,
but about program starters.
I use WhereJames startup manager to control which applications start at
boot:
http://www.wheresjames.com/index.php?page=startupmgr
WheresJames doesn't catch all the services, though. To fiddle with
services, run the program msconfig (it comes as standard in XP). Click
the Startup and Services tabs to see what's running (there's a lot!).
You can enable and disable it at leisure. I'm not sure if the settings
persist on a reboot, though.
BTW, I think GAG is a great program. Very easy to use - but the OS must
be installed in its root partition, rather than the MBR. I've heard some
people complain about this approach, but I think that it's the best way
to tackle booting.