My kids give me the web addresses of the desired items via email. It seems somewhat cold, yet I have their lists conveniently stored on my Macbook, they get want they really want, neither of us has to return and exchange anything and I don't have to wander around the shops, thinking "will they like this or will they think it's yet another misjudgment by Mom?"
I'm hoping SantaBaby brings me a gift cert. for a bike fitting, which I think he should have no trouble shopping for and I drop that hint loudly and often.