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http://brightkite.com/
BrightKite is location based social networking. It will post your current location to twitter, and other cool stuff. Currently invitation only (unlimited invitations).
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http://cloudmade.com/
CloudMade are a mapping technology company built by some of the people behind OpenStreetMap.org, using that data as a base. Professional open source mapping services.
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http://www.flickr.com/map/
Flickr produce maps of geotagged photos. Could be useful in putting a travel map together.
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http://code.google.com/p/gmapcatcher/
An AWESOME piece of code that creates a python based gui google maps browser and auto-downloader for offline user. Really, really, really useful. :-)
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http://bluweb.com/us/chouser/gmapez/
Want to put a Google map on your web page? With GMapEZ there's no JavaScript to write and nothing to download. You simply insert a div, add some xml, and bingo, the javascript does the rest.
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http://mapki.com/wiki/Google_Map_Parameters
Very handy page that contains a list of all the url parameters for Google Maps allowing the easy creation of custom maps without a google account. :-)
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http://www.systemsevendesigns.com/phoogle
Google Maps API Class. Insert Google maps with simple PHP class method (function) calls.
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http://www.mapstraction.com/
Mapstraction is a library that provides a common API for various javascript mapping APIs to enable switching from one to another as smoothly as possible.
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http://www.freemaptools.com/measure-distance.htm
Handy google map that has a ruler. Drop points on the map and it calculates a running total of the distance between them.
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http://modestmaps.com/
ModestMaps is an open source flash (ActionScript) library that displays tiled images (from google maps, open street map, and others). Similar but smaller /simpler than OpenLayers and in ActionScript not Javascript.
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http://www.navicoretech.com/Consumer/Support/Downloads/tablet/en_GB/wfnavigator/
Download maps for the Map application on the N810 tablet without using the in-built software. Very useful. :-)
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http://www.openlayers.org/
OpenLayers ia a pure Javascript mapping library that uses a number of commercial / open tile providers but creates its own API completely bypassing the commercial API.
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http://www.openstreetmap.org/
OpenStreetMap is a free editable map of the whole world. It's a wiki-like map which users can edit. You can upload GPS traces of areas and add street names, etc. Eat your heart out Google Maps.
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http://www.phpinsider.com/php/code/GoogleMapAPI/
A PHP class that allows for the easy (and relatively painless) insertion of Google maps into web pages. Instantiate the class, call a few methods, bingo.
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http://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
The Ramer-Douglas-Peucker algorithm allows a curve to be reduced to fewer points with minimal distortion. Useful in mapping to simplify plots based on zoom level.
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https://shop.altova.com/category.asp?catalog%5Fname=V2011R1C1%5Fshop&category%5Fname=MapForce&Page=1&MSCSProfile=95385A1F52DEA1A229D5B37542054464644F14B727CFA53C285C4F3EF803450B4B66DD67EC7DCC291234E6391E8ECEE79A6EEBFAFB8E3F804ADC10AD0297C7A4A5914EA5C4C78A03CEC993CEC25428609F91EC447B9C6BA71256817BEFA15C90E71ECB70A25EC85D5198A2C0A1C0327447F30A72907C16C9F2D6AB8BC232A8BF7FD055D333773031
MapForce software that converts all sorts of plain text data files into KML or other mapping formats. Includes a feature to generate royalty-free executables that re-run the conversion process, interesting. Expensive.
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http://upload.wikimedia.org/wikipedia/commons/e/e5/World_map_with_equator.svg
A CC-BY-SA licensed world map with the equator marked courtesy of wikiCommons. Could be useful for building other maps.
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http://www.multimap.com/
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http://maps.yellowpages.co.za/
Yellow Pages provide the (currently, Jan 08) best available online mapping service for South Africa while Yahoo Maps, Google Maps, etc appear to have no street level data.
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http://openlayers.org/pipermail/dev/2008-April/002756.html
Comparison of Mapstraction and OpenLayers from an OpenLayers developer. Useful and balanced discussion of the differences.