Linksys found a place in many a geek's heart when it released the original WRT54G router back in 2003. A network router, 10/100 Ethernet switch, and wireless access point all rolled into one, the WRT54G blazed a happy trail as one of the earliest home networking devices to have its firmware source code made publicly available under the GNU General Public License (GPL).
http://www.extremetech.com/article2/0,1697,1934591,00.asp
Everyone knows Powerbooks have terrible wi-fi reception. Unfortunately, only 15" and 17" Powerbooks facilitate adding your own external antenna. With just a few quick cuts you can modify a 12" Powerbook to take an external antenna as well.
http://www.instructables.com/id/EHDHDZ2MCCEP2868FX/
This project is to make a homebrew wireless ISP in your neighborhood, this is to share your internet connection using wireless technology.
http://www.instructables.com/id/EC0VP9FMG1EP286LVV/