[REQ] Ability to have link show in more than one category?

[Torqued]

For example, I am setting up a site for a specific profession. There are some sites that are good "general information" sites for this profession, but, they are also an "online publication/magazine" for this profession. It would be nice to be able to include these sites in a "general info" category as well as a "profession publications" category without having to add/maintain 2 (or more) separate entries.