Backing up Photoshop brushes

OK, this might seem like an incredibly daft question, but I am moving from my faithful iMac G5 to a screamingly fast new MacBook, and am going to give the former a fitting retirement and become the home entertainment hub for the family and let the MacBook handle my graphic design. Anyway, I am moving files over and have suddenly realised I don't know how to copy over all my Photoshop brushes that where carefully sorted through and renamed on my iMac version. I am using a copy of CS1 (yeah, I know, a bit of a waste on a brand new Intel but I can't afford a copy of CS3 yet) which I will remove from the iMac, but I want to get the brushes over first. Does anyone know how I can do this, and preferably keep the names etc? This would be really really useful as I dont have any of the original packages they came in when I first downloaded them! Many thanks in advance!

I have gone to the Brushes folder in the Photoshop folder. I have about 8 brushes in there, like Assorted Brushes, Basic Brushes etc, plus a Adobe Photoshop Only folder that has four brushes in, Dry Media, Special Effects, Thick Heavy and Wet Media. I think I have over 200 individual brushes that I have installed in Photoshop, that I have renamed things like Grunge 1-30 etc. Would they have been packaged into these listed above or would they have been put elsewhere?

Tried searching, nothing came up. With the packages I installed, I just had Photoshop open and double clicked them, they just then appeared in the brushes section, where I then deleted the ones I didnt want and renamed the ones I did so I could know what is what.