For some reason I cannot run your pre-built binaries for Linux. I rebuilt scrabble3d.lpi on Ubuntu 9.10 32-bit (quite an adventure, actually) and it runs without errors (well, the opengl panel is somewhat tricky but it's a glscene issue, I guess). However, to compile umain.pas and ulocalmessage.pas I had to edit the files (the booltostr() function only takes 2 params; and a case statement using strings had to be converted to if..then..else statements).
I think the Scrabble3D project is a very good integrated example for many features available in Lazarus/FPC in combination with open-source third-party libraries and components.