Google AdWords content network now browsable by category
The AdWords team has added the ability to browse the content network sites by category. The category list is pretty lightweight right now, with not enough specificity in many areas. It is not clear if they plan to expand the directory structure, so at the moment you will probably still find it useful to search by keyword. Another issue, created in part from the lack of a complete classification system, is that the limitation of only viewing 100 sites in a category means that you don’t get a complete list; you may be left wondering what other opportunities didn’t make it in the top 100.
More information can be found here.