I created my own Invoices (using OpenOffice) and saved them to a free Google Drive Account. When I need to send an Invoice (or a Quote), I just create a copy of

I created my own Invoices (using OpenOffice) and saved them to a free Google Drive Account. When I need to send an Invoice (or a Quote), I just create a copy of the Invoice (using the Customer's Name), fill out a few fields, convert the file to PDF, and E-mail it to the Customer (cc'ing myself). When I need to look up an Invoice to verify something or do Taxes (or whatever), it's all saved and searchable on Google Drive (and backed up on my E-mail Server). It's paperless, simple, and free. You could do the same thing (or similar) with Dropbox, Box, or another similar Service.