You can use whatever software you like. Provided it's a small library, there's no reason you shouldn't use Excel. All you need do is to make sure your catalogue consistently records all the important detail.

If it's for just a personal library, you might want columns for nothing more than Author/Editor, Title, Publisher & Date. For a shared library, you'd probably need to split the Author & Editor and you might also want columns for Volume, City of Publication, Country of Publication, Language, Translator, Edition, Borrower, Date Borrowed and Return Date - and you'll probably need to allow for more than one copy of the same Title to be input & managed.

Personally, I'd be inclined to use software designed for the purpose, but I can also understand why someone else might prefer to stick with something familiar.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]