Recently I purchased a used Cisco Linksys wrt-54g from the local Goodwill store specializing in computer stuff real cheap. Knew that you could upgrade the firmware with dd-wrt, openwrt, and a host of others. In fact, I think I had installed dd-wrt. Wanted more like what my brother has. After doing some research, I found some firmware. Known as CoovaAP, it is known is what is called a Wisp (wifi inTERnet service provider. Well I wanted it for our intranet (local area full service network without internet access). We have sort of our own mini cloud (web, media and etc.) servers. So it still is a Wisp (Wireless inTRAnet service provider. You can also set this software for a stand alone machine acting as a wireless access point.
Installed CoovaAP on the router and now it can be accessed within the range of the router. This is a great set up say for a school, church, or in a small town. More information at: http://www.coova.org/CoovaAP
One application I like to use installed on the web server is eyeOS (http://www.instructables.com/id/eyeOS/). It is sort of a gui driven web desktop that works perfectly with your touchpads, ipads, and or laptops. We use it with the Chumby.