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Beyond Diigo: there is a growing number services that provide scripted (e.g. Diigolet) or installed approaches to commenting upon web pages. I find/place most related discussion in Maggie's Web 2.0 group. In my experience, none of the alternatives to Diigo offer such a rich or high-performing service.

I really think it should be highlighted on the homepage like Fytch - Installing an extension is a decisive influence in choosing a service. It's one of the most important reasons I use Diigo - I can't install the toolbar everywhere I go. Diigolet, a mention on the first page... I think is a A MUST!