If you know VB, C++ and jave and you'll be fine, as far as i know, all the scripts here are wrote in VB.
As far as working with your card.. I also have a Radeon x800 and The public windower works fine(I prefer it over XU's Windower since XU doesnt support game pads that well)
The fishing scripts are nice(I've only used them once or twice but they seemed to be working nicely). I mostly use things like the Auto-Mob farmer for farming synthing materials, etc. The Radar is a nice feature as well since it shows all mobs in the area(it provides live creature info, however it also displays dead mobs.. :S) But, there is endless possibilities with XU's and i feel its definately worth the 24$ i paid
