Does anyone use Ballpark for invoicing/estimating/tracking? I just came across it, and it looks pretty great. For a freelancer it's $6/month. For the few freelance projects I do, I basically make my own invoices, etc. But this looks pretty handy. Might be a nice addition if I get into more freelance work. http://getballpark.com/
Are there other similar sites/programs out there that anyone uses?