geowiki
Reviewing my past web projects, I’ve put the geowiki in nostalgy mode, i.e. password-protected the editing function to avoid further spamming. Since writing the app in early 2006, online mapping has fortunately evolved a lot, both Google Maps (and competition) as well as the great and free alternative from Open Streetmap. The concept of directly linking a map and a wiki still makes sense to me, though current mashups usually only allow small user inputs in form of comments, or contents that fit into a bubble to be displayed within the map.