Link Lists & Web Rings
The lists are useful databases on anime, comics or manga. They include a vast variety of related sites, and categories, which leave no excuse to people asking where to find anime site etc! If you're looking for something in particular, these can be a much more efficient method than a search engine.
The Web rings link off to other artwork related websites contained on the ring. Probably the best way to surf for random sites! I just wish people would stop making such butt-ugly, awkward ring banners! :(