Simple Spark has a searchable inventory of Web 2.0 apps, with the ability to bookmark them on-site with a free account. Enter “maps” as the search term, and 147 sites pop up, many of which I hadn’t heard of before (GPS currently only yields 4; GIS, 2).
"This site" searches Free Geography Tools; "Web" searches the Internet using Google.


Very impressive list. Got a lot of bookmarks from that. Cheers.