John Musser has compiled some stats on the mashups of 2006, with 1,404 mashups clocking in at year’s end. The number one mashup API of the year? Google Maps, with 51 percent of all APIs. Yahoo’s Flickr API took second place with 10%, while Amazon’s API ranked third at 8%, followed by (Google) YouTube mashups in fourth with 4%. Google Maps has a lot of buzz and geek cred, and it’ll be a challenge to maintain a lead of that size in the next year, especially with Microsoft’s 3D maps gaining steam.