I just want to tell you guys (and girls if any) that the WL-500W is about the same as the WL-500gP. Actually, the only difference is the wireless chip, so all tutorials in the wl-500gP forum are ALSO working on this device.
I had a WL-500gP, but it broke, and I save everything from it, and guess what, it worked too on the W

so for a start on the oleg firmware use (the best one around):
http://wl500g.info/showthread.php?t=10307

you need oleg firmware for the wl500w?
http://wl500g.dyndns.org/1.9.2.7-8/