The most common one that works for me is to do a quick site survey and see if the neighbors are on what channels and then pick the one farthest away from theirs.
There is also that nutty SSID that people disable. I turn it back on and some drops stop dropping. The pundits got that one wrong.
I bought a brand new D-Link DIR-655 router about 2 weeks ago. It installed properly and everything ran well for a little while. it still does, but not for very long. It'll be up for a half hour/hour tops, then completely lose the signal. My computer still says its connected, but no web pages load and I can't connect to anything. If I click on status and repair it, it comes back, and if I leave it alone eventually it does too. But even after that it still drops.
My OS is XP Pro SP2, isp is Optimum Online. The router firmware is v1.02 (the most recent fw). I called support today, did all kinds of reconnecting, resetting, and changing settings in the router. None of it worked. Please help, somebody. It's driving me insane.