If it's somthing quick and simple that would make his life easier, I'll gladly do it - he's good enough to me!  He also travels overseas a lot, so I have to do odd things for him whilst he's on the other side of the pond.  One of the oddest was cancelling an appointment .... with a tattooist!

However, I think if we got into the realms of choosing wife's/kids' presents, I would have to say no.  Although I know them all, I don't feel I know them well enough to do that sort of thing.