CUSTOMIZABLE AND COLLABORATIVE MAPS
Click2Map.com - Create custom Google Maps, manage your markers, publish and share your creations.
ClustrMaps.com - Get a visual representation of all the visitors to your website.
Geotag it - Add geo tags to Flickr and Del.icio.us posts and see where other links and photos come from.
MapBuilder.net - Uses Google Maps to help you build a custom tagged map you can add to your own website.
Mapicurious.com - Mark vacation spots, restaurants, bars, just about any place you would recommend.
Mappr.com - Another site allowing you to geo tag your Flickr photos to allow people to see them on a map.
Maptales.com - Tales of trips and more sorted on to a Google Map.
Maptrot.com - Create maps of interesting locales such as Route 66 or major sports stadiums, share them with the world.
Mkmap.com - Collaborative map that allows users to add things such as transit services and restaurants.
OpenStreetMap.org - A user editable map of the world to be worked on in collaboration.
Pixagogo.com - Add your own photos to a Google Map, give people a real feel for your neighborhood or vacation.
Planiglobe.com - Customize a map and download PostScript and Illustrator versions.
Quikmaps.com - Doodle on a Google Map, pass it around, embed in your site, or download it to your GPS.
Tagmaps - A way to visualize text on geographic maps, then can be used on your site.
Traffic.com - Check out traffic for your area on a map.
Trippermap.com - Tag your Flickr photos with a location; they get added to a flash based map for your website.
Useamap.com - Helps you publish a map for your event, provides a short url for easy use.
Wayfaring.com - Create and share maps, explore ones made by others.
Wayki.com - Tag locations and share with others, explore tags others have left.
YourGMap.com - Customizable and embeddable Google Maps with content you choose.
goDCgo.com - Look up Washington DC-specific information such as traffic, special events and car pooling.
IamCaltrain.com - Interactive map of the San Francisco metro area trains.
onNYturf.com - Interactive subway map of New York City.
Seattle Bus Monster - Plan your bus routes in the Seattle, WA area.
SUBJECT SPECIFIC MAPPING
DaylightMap.com - See where the sun is shining currently on this map.
Feedmap.net - Add a geo-code to your blog so people can look blogs up by location. You can also browse for areas that would interest you.
FlightAware.com - See how many planes are currently in the air and where they are.
Gruvr.com - Place to look up local music and add tour info.
HealthMap.org - A global disease outbreak map. For general interest or to suggest places you may wish to avoid.
Hotpotr.com - Map of Wi-Fi cafes and hotspots.
Incident1.com - Interactive map of 911 calls from around the United States.
Mailboxmap.com - Enter an address, get the locations of USPS mailboxes nearby.
Map-Runner.com - You can create a run route and assign a difficulty rating and a safety rating; it will be available to all runners using map runner, and they can rate it.
MAPLight.org - Shows geographical connections between congressional voting and money donations.
MapMyRun.com - Plot out your running course, indicate where water and bathrooms are, calculate your workout. They also have MapMyHike.com, MapMyRide.com, MapMyTri.com, and MapMyWalk.com.
MappyHour.com - Click anywhere on the map to display nearby bars and their happy hour specials.
MapWii.com - Enter your Wii number and see other players online to setup games all from a geographic map.
Moremap.com - Uses Google Maps as a basis to show earthquake activity, traffic reports, radio stations, and numerous other functions.
Platial.com - Add content from video, photos, stories, feeds and add it to your website.
PublicRoutes.com - A global map of mass-transit systems.
SignalMap.com - Find or add your own reports on cell strength to various locations and by carrier.
Tornado Paths - Visual history of tornado paths on a map.
VirtualVideoMap.com - Shows a Google Map with YouTube videos sorted by locations.
POPULAR MAPPING SERVICES
Ask.com Maps - Ask.com's driving directions solution.
Google Mars - Google's interactive map of the fourth planet of our solar system, Mars.
Google Maps - Get directions, look up your house with satellite photos. The basis of many websites.
Mapquest.com - Look up local businesses, get driving directions.
Poly9 FreeEarth - A free, online interactive 3D globe with various layers you can apply.
Windows Live Local - Microsoft's entrant in to the mapping game.
Worldmapper - Maps of the world resized based on various subjects such as land mass and population.
Yahoo! Local Maps - Get driving directions, find businesses and much more. (via)