Does anyone know of a good program for keeping track of customers/clients? Preferably something free or very inexpensive.

I've been trying to play with this one, but it's not really working for me (I seem to only be able to get to the client-side of it - which is unnecessary - and not the administrative side). It really doesn't have to be web-based either.

I'm sure a basic spreadsheet could accomplish the task, but it doesn't scale well in this instance.

Any suggestions?