This purchase is one of the reasons Yahoo! is more exciting to me than Google, right now. I was surprised, though, that you didn't mention Yahoo's own My Web 2.0, which, in many ways, is an improvement on del.icio.us. My Web 2.0 avoids Greg's dreaded spam by allowing you to restrict your MyWeb searches to trusted contacts. Also, MyWeb 2.0 allows you to archive the page you're bookmarking, which is a great feature. If nothing else, the del.icio.us acquisition brings a lot of people with a lot of experience in this area of "tagging" the web into the Yahoo! fold. Hopefully, Yahoo! will be able to use their expertise to improve their service, which is great but clunky.