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When I get a verbal request, unless I'm in a position to action it immediately, I would ask them to email me. I am usually involved in 3-4 tasks at anyone time, have at present 4 pcs, 1 laptop, a cctv recorder, a scanner, 5 technical books open and loads of papers, keys, cables, disks etc all around my office (I admit I don't subscribe to a tidy desk policy), and so reminders need to be kept in a single organised place. And that place for me is email. If I didn't get the requester to email me, I would probably email myself.