Want to know which mashups and other examples people find most interesting? Try programmableweb.com/popular. As inspired by del.icio.us/popular this new feature lets you see which links are most popular with users. In this case rather than users' bookmarks it's mashups and other API examples. It's a little feature but kind of interesting to see.
There are two variations of what 'popular' means: the first is 'Visits' which is how many times have people visited those sites by clicking on links from here and the second is 'Votes' based on an average 'rating' where people have explicitly voted on a 1 to 5 scale. The latter is a feature I added awhile back but never really publicized. You can rate any link by viewing its 'Detail' page, like this one for HousingMaps.
If it was sorted in the opposite order would it be /unpopular?