Hi Jupiter,
please take a look at a template "social bookmarking" template I was building as an add on to the "property template module":
Nukenotes.com/social bookmarking
what you can do with it:
1. Create categories and sub categories of websites.
2.Each link has a :url, title, summery, description, tags).
3. Each link has a rss preview, which of course links to the web site's blog or gallery, etc". (I was doing that using Google new service.)
4. Advanced search and sort options.
5. A few "latest" companion modules options. (e.g latest added, most popular, only features, filter by category etc").
6. preview website preview using "snap". ( not part of the template ).
7. Supports "tag button which lets you tag the link to your (other) social sites.
Users:
1. Supports roles to allow user add they links. you can moderate it, you can charge for it you can do it automatically and so on.
2. Supports email to the link 'owner".
3. Supports report spam.
4 Other......
Please let me know if you have any other questions, I can customize it for you if you'll need.(e.g you'll get a quote)
Thank Avi.