from CodeJunkies.com has got some great codes for the ARMAX that unlock some nice features. Including uncensoring the 'Hot Coffee' mod. These codes only work on the NTSC version of the game though, hopefully we'll have some PAL conversions soon.**UPDATE**
Skiller at GTAForums has posted the PAL versions of these codes.
Since the post would be too long to put on the main page I've put them in seperate posts. Links below.San Andreas ARMAX PS2 Codes:NTSC CodesPAL Codes
Thanks to our friends at GTA-SanAndreas
for the heads up.