Tagging Social bookmarking

I see a need for Drupal to be able to act as a social bookmarking service, and I think it should be very easy to make a simple module to handle it. The basic functionality would be that a user (either authenticated or anonymous) would be able to post links to drupal with a simple "GET" form, either as a drupal form, or right from a url... For example:

http://example.com/bookmark/add?href="http://google.com"

Hi

I am developing a bigger site (D5) with a free tagging vocabulary. Currently the vocabulary has 16.000 entrys. i have searched with google and on drupal.org, but I have not found some performance improvement like cache or pacthes.

What are you doing?

I think I am not the first one with bigger vocabulary. Some links or code snippets would be great.

thx
bennos

Here on this page you can see he has a social bookmarking mod and a weighted Tagging mod installed.

http://www.seoecom.com/cms-taxonomy

Any ideas what mods he is using?

Also What was the drop down menu that was brought up in last nights meeting?

Thanks!

-J