I would do the following
firstly instead of competing against the other social bookmarking sites, which lets face it that is going to be pretty hard to do, i would make the site compliment them.
Front page would be most popular articles from say the top 10 social bookmarking sites.
This in its self would be great, a one top shop! and dynamic content!
Visitors could join and then i would offer features that monitor the top 100 (yep 100 sites) sites articles for keywords.
for example if a visitor was only interested in SEO the site would just track articles that had the the keyword SEO you could then have the user set this as there personal start page, also the visitor could get email alerts or monitor via Rss .... hmm wanna sell me the domain  only joking
OzJames
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