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Ok, since we are discussing this I feel I should provide a list of packages I am aware of to record this info in. So here's some windows software I am aware of for this task.

Starting things off: Coloseum Software's AIMI eBook home. Available for "free", if you make a $20 donation to the Firearms Coalition from here.
Next we have the package mentioned above, and the one I use, Gunsafe.
Finally we have one that has multiple versions, one can run on windows natively, and two are Java Based: NM Gun Collector.

I use GunSafe myself, running under wine as well as my spread sheet. I did get a hold of a legally licensed copy Coloseum Software's Aimi Ebook home for free, currently you can get a copy by donating $20 to the Firearms Coalition. Its a Much better, and more powerful package, home version of a package that is intended for use as a replacement for an FFL's bound book. Unfortunately that package does not get along happily under wine and it has ruined my experience with gunsafe so I am threatening to "Roll my own" solution.

I keep two records on my firearms. The first is an open office spreadsheet, and the second is a windows application that plays somewhat nicely under wine. I keep a complete backup of both on CD-R that is kept off site in case of fire, burglary, ect. My advice to anyone wanting to keep a record of their firearms is to do the same.