May I take a moment to sing the praises of GoToMyPC?
This is what happened when I went to reduce my account from two-PC usage to a single remotely-accesible PC:
I’m choosing to spend less money with them, and assumed that would take effect the next billing cycle. Instead I see an immediate refund of the current month’s unused extra-PC balance.
Add this to the fact that GoToMyPC just works, beautifully, all the time — they have me as a customer for a long, long time.