So i've installed Photoshop CS4 on my mac and it is kind of confusing: there is no background, so you see the desktop, the shotcuts are different... hmm, so i've been looking on the internet and found a few interesting and useful places, and before i forget every address i've looked up, i'm just going to post them...
http://sixrevisions.com/graphics-design/40-useful-cheat-sheets-for-designers/
http://www.20seven.org/cgi-bin/mt/mt-search.cgi?search=cheat+sheet+&IncludeBlogs=1
and i had a few more and now i've lost them, oh well...