Another vote for the latest dd-wrt firmware. It is stable, great wireless, and the web interface is very fast and complete compared to the lame Netgear firmware web interface.
For instructions on flashing dd-wrt, look at the README file in Kong's firmware repository. It is simple, but a few instructions never hurt *smile*.
Netgear is rumored to have new firmware coming out at the end of February, we'll see about how that looks if and when it arrives. I have to admit, I'm not impressed with the Netgear firmware so far or with the web interface that they provide. While I've been spoiled by RMerlin's web interface, none the less, the Netgear admin web interface is about the lamest that I remember.