This is a nice cheat sheet from http://outsourceage.com/wordpress3CheetSheet.html It summerises all the functions used in wordpress 3.0. It is very helpful upgrade your older themes to wordpress 3.0 compatable. The original cheat sheet is in html format. Download WordPress 3.0 Cheet Sheet my image format and pdf format here. You can view the html here.
Decrypting the Encrypted footer of wordpress themes is realy a mess. It is basically a base_64 endcoded string. But decrypting it is not easy. Ottodestruct made a nice decoder of these string for decrypting and editing the footer of free wordpress themes. You can copy the decoded PHP footer and change the name of the