I've succesfully ran Poptop on my WL500g with the standaard v1.7.5.6 firmware. But it has some problem's with connecting from XP(something like a 1/20 change that connection is succesfull). Still searching for a solution. Further more mppc compression crashes the WL500g. Still wan't to look into that to. And i've just upgraded to Oleg's firmware but that broke something Poptop depends on.
But on the moment the guy who is my other end point of the tunnel is on vacation and i'm going to so it's probably gone take some time before i can fix these things and post a package.