Clone this wiki locally
Publish your tiles so others can see them. Amazon S3, EC2, CloudFront, your own server, MapBox.com, etc.
If you don't prerender every tile (which can be time or resource intensive), another option is to setup a live render-cache system using TileStache on a web server.
MapBox.com plans - Render your tiles using TileMill or convert them to the MBTiles interchange format and host on MapBox.com.
TileDrawer - Run a simple little EC2 instance.