I've been a big fan of Xmarks for a while now -- I work on a few Macs and PCs regularly, and while MobileMe is nice, I've always appreciated Xmarks' ease of use (after a one-time setup, it basically worked automatically) and compatibility across whatever browsers I happened to use. That's why I was disappointed to hear yesterday that they're calling it quits. In around 90 days from now, the servers will shut down and Xmarks will be no more.
Co-founder Todd Agulnick goes through the story of the service on that blog post -- it was originally developed as Foxmarks, and designed to work directly with the Firefox b
