I need to do that same thing. But in addition to that, for my own protection during a "legal inquiry" should it ever come up, ESPECIALLY after the '08 elections, is snail-mail myself a listing of what I own with serial numbers where applicable, number of magazines and their capacities for each gun and photocopies of all recipts. When I get it back, I will NOT open it. During the aforementioned inquiry, I will note the POSTMARK DATE, which is allowable in a court of law, then open the list and ask if they have anything else they'd like to know.
P.S. to mudpuppy - DO NOT trust hotmail or yahoo, I lost 2 hotmail accounts and one yahoo account. I don't know why they were deleted and I got no answers when I checked into the problem. If you'd like a gmail address, I can send you an invite, just PM me your hotmail and I'll get you set up. It's free and right now has over 2800mb of storage.