In reply to Toby Benson:
As another poster mentioned, it would be really useful to know what kind of climbing the person does. But for inspiration, these are some of the gifts I've received over the years, all have been great presents and really appreciated:
Petzl Spatha and a few metres of 7mm cord.
Petzl tikka head torch.
Two petzl crampon bags. One for crampons one for ice screws (a very well thought about gift).
Gripmaster finger trainer, unexpected and useful.
Gyroscopic/powerball thing. Surprisingly addictive.
Chalk bag and chalk. For some reason its just nice to get a new one every now and again.
Small titanium stove. Some unspecific brand, but has been an excellent little burner.
The great thing about all these presents are they were unexpected and usefull, or things I didnt know I needed but turned out out to be very handy!