Like many GMs, I'm perfectly content to sit around and think up new ideas for campaigns or one-shots (with only about 10% of these ideas ever making it to the table). Also like most, I really enjoy just sitting around and listening to/reading other people's creative ideas. These are best when presented as two or three sentencea giving the basic idea of the concept (and allowing the reader to fill in the blanks). Dragon Magazine would periodically run articles on world and campaign building that fit this mold nicely (unfortunately, the new Dragon seems to eschew this older practice).
Are there any sites (regularly updated preferably) or periodicals that are either dedicated to or focused on short campaign hooks/plot ideas?