If you do adopt the snake out - make sure you keep in touch with the new owner so that you know what is happening with the animal. I adopted out a couple snakes (2 that were given to me because people moved and their new apartments did not allow snakes) In both cases I knew that the new owners I had found had prior experience in dealing with snakes and I still keep in touch with them today though myspace to make sure everything is going well.
I actually keep in touch with most of the previous owners or breeders of the snakes I own now - I got 2 snakes from Kathy Love 2 years ago and I send her e-mails every year with pictures of the snakes showing how much they've grown and that they are having a nice life here! My other snakes were bought locally and I'm friends with almost all the people I got them from on myspace so they always see the latest pictures of their old friends
Make sure that they contact you first if they do ever decide they are no longer interested in the animal - that way you would be able to give it a home if it really needs one - or find a new home with someone who you trust!