Serpenteye said:I doubt that any sapient creature of any alignment would be very pleased to be summoned and enslaved
I was specificly answering the question of the initial poster, which was dealing only with celestial beings. Anyway... not all outsiders mind being called. A fair number of devils are quite fond of it, regardless of what they're asked to do. They see the mere fact of them being summoned as corrupting the caster and bringing him closer to evil. To grab something from the DM's guide to Hell I put together:
"The unofficial motto of the Ministry of Mortal Relations is “If you’d just sign here, we can conclude our business”. The Dark Eight set up this organization to govern contacts with mortals. This includes summoned fiends and mortal visitors to the Nine Hells. Several schools are run by the Minstry of Mortal Relations, including one where imps are trained by Erinyes teachers (with Kocrachons to provide inspiration) to do their duties."
If you want to take a look at The Nine Hells, a DM's Guide pdf, go here
http://www.knology.net/~pawned79/Arravis/28487-NineHells.zip