WiFi unusable in high density areas?

Living in a densely populated area in Silicon Valley, I find my WiFi network less and less usable. On a given day, there are between 20 and 40 access points that my laptop can find without any external antennas, etc. Every couple of weeks, I check what channels people are using and try to select one as far away from the majority as possible. Alas, the signal noise is so great with this many devices in such a small area that my laptops constantly drop their connections. Even when they get a connection, the bandwidth is pathetic. I assume that switching to 802.11a would help a bit, but I already have a decent amount invested in b and g equipment. I’ve reverted to using network cables which are now draped all over the place.

A plea to the FCC: Give us more bandwidth!