All you need to do is put the brush files in you're adobe photoshop brushes folder - for me it is located here:
C:\Program Files\Adobe\Photoshop CS\Presets\Brushes
Just make sure that if you have the brush packs in ZIP form that you extract them to that location (i hope this makes sense!) Then once you go into photoshop, all you need to do is load the brushes you want to use.
Have a look in our downloads section of the forums and you will probably find some sets to download there - I think i have most of the recent ones from there if the links don't work any more, if you need them just let me know.
