The program to download isn't a beta. It's a spreadsheet, created in Excel. It's been around for about four years, and should have any kinks ironed out. I certainly haven't received any e-mails with problems in the last year or two. The beta (for the web-based version) hasn't launched yet.
Could you do your budget on paper? Sure. You could also never send e-mail, opting to send all correspondence by mail. The point of it being a spreadsheet is that it does the bulk of the analysis for you. Really, using PearBudget, you can update your budget during the commercial breaks of your favorite TV show, and that'd be it for the week. It's really, really, easy. And it's free.
If you don't want to download it, then don't. But it's not dangerous, and I have no motives in offering it other than that it worked exceptinally well for me as I got my personal finances under control, and I wanted to make it available to the general public.
If anybody has questions about it, post them here and I'll try to respond.
Thanks.
Charlie