Hm... Blender 2.5 and above has a search function... I think you hit "space" and then just start typing the name of the function you're looking for. However, I still use 2.49 because it's what I'm familiar with, and I only use blender for a few simple things that Sculptris+ZBrush would be overkill for.

In Blender 2.49, select the object you want to edit and hit TAB to go into Edit Mode. Once there, in the default layout, the centre-bottom of your screen should have all sorts of different buttons labelled "Noise", "Hash", "Xsort", and a bunch of others.

Jibb