da | Dear Lazyweb: Geneology/web?

I was wondering if anyone on my friends-list has done any family-history and have any programs or web-services to recommend. I don't have a ton of time to spend on it, but I have 5 pages of family-tree which I'd like to clean up and record somewhere in a reusable format.

One of my mom's relatives uses 'Reunion' for mac. It's $100, which is a pretty penny for a not terribly attractive-looking program.

Open options are: a mac program, a web-based system so long as I can keep records private and I trust the service-holder, or a windows or linux program if it's quite a bit better than anything available on the mac (since I've got Parallels and the latest version works quite nicely.)

A quick look around the web suggests that a major complaint about geneology programs is that they all use different tweaks to a common format, which suggests they're all mutually incompatible. Grr. It's quite possible I'm overlooking something good, which is why I throw myself on your mercy.

Thanks.