Here you can find developer-oriented resources. T(+)rget has written a small guide to the new version of VexdUM, which you can read right now.
A page about using the Translator should be there soon as well with detailed examples more intuitive than what can be found in AMX Mod's plugins and .inc files.
Another page about the conversion of the AMX Mod X plugins into AMX Mod plugins (using the amxmodx_to_amx.inc include file) should be there soon. Meanwhile, this .inc file contains to its top a small description about conversions. Read it!