USE THIS FIRMWARE AT YOUR OWN RISK!
Firmware for the WL-500g can be found here:
http://www.asus.com.cn/pub/ASUS/wire..._WL500b_EN.zip
http://www.asuscom.de/pub/ASUS/wirel..._WL500b_EN.zip
ftp://ftp.asus.com.tw/pub/ASUS/wirel..._WL500b_EN.zip
http://www.asus.com.tw/pub/ASUS/wire..._WL500b_EN.zip

Changelog:
1. Fixed: Remote Port Pringting
2. Fixed: Port Range Issue
3. Fixed: Web Camera May Sleep When There is no motion.
important!!
When upgrading from 1.7.x.x based firmware: Reset your WL500g to defaults via the restore button at the back after upgrading to this firmware!

you do not have to do this when you upgrade from 1.8.x.x based firmware!
Mirror @ Chupa.nl:
http://files.wl500g.info/asus/wl500b..._WL500b_EN.zip