SimpleGeo Context provides relevant contextual information such as geographic boundaries, weather, and demographics for a specific location.

This build environment compiles GDAL and MapServer from the subversion and provide cutting edge binary packages containing the latest fixes until the time when build has started (refer to build log for the details). Only the binaries of the latest successful builds are available to download. Includes build of API bindings for OGR/GDAL

Portable, offline map visualization. Interact with highly custom maps and visualize your KML and GeoRSS data offline with MapBox for iPad. Maps and geo data are stored directly on your device, so you can use the application without an Internet connection.

MBTiles is a specification for storing tiled map data in SQLite databases for immediate use and for transfer. The files are designed for portability of thousands, hundreds of thousands, or even millions of standard map tile images in a single file.

This makes it easy to manage and share map tiles.

Displaying the predefined icons that can be used for markers with Google Maps Google Maps Icons,ONLINE LINKS for official-placemarks: 

Free downloads of USGS topo maps at scale 1:24,000. Available as high-resolution TIFF with georeferencing

Here are informally described important cartographic concepts, how maps are drawn and why there are so many different kinds of projections for world maps.

"Almost four years on from Mapping Hacks, the state of web-based mapping is moving within reach of mortals and designers. The one piece of software most directly responsible is Mapnik, Artem Pavlenko's excellent open source rendering library. Despite a not-undeserved reputation for being difficult to install (there are even what appears to be companies offering Mapnik as a service), once you've got it running there's nothing better out there for generating your own web-based slippy maps." some notes on producing high-quality tiled maps. Interested independent of Mapnick

Allows for query of reported crimes in specific neighborhoods

Map + breakdown by category of all of the homicides in LA this year.

PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL serve