A tutorial on How to set up Lazarus for Mac or... JEDI-SDL for Delphi on Windows, Mac & Linux or Lazarus on Windows, Mac & Linux would be great too. It also could then be often referred to by other tutorials that use JEDI-SDL as a base for graphics and such. This is good practice in tutorial writing. You want to teach one thing typically not everything else leading up to it as well.

A C to Pascal 101 could be a good topic too. For those that know C, but would rather code in Pascal. A C/C++ to Object Pascal tutorial would be even more interesting too. Though I think you could end up getting carried away and end up with a whole book in the end.

Mostly what we want are tutorials that just teach simple concepts that will take a person with basic programming knowledge and start them into making games.