I was poking around last night, apparently GNU doesn't have a Delphi compiler
My understanding of Delphi is that someone took Pascal and made some enhancements to it. I think that company owns the rights to the language, or something, and that's why there aren't any free compilers out there -- you have to go through them for the development tools.
Anyway, I should think
This book would be a good investment for you. It outlines how to switch from language to language with ease . . . basically, once you can write code in one langauge, you can write it in any language. (I'd check around on the net, though . . . you can probably - er, most definitely - get it cheaper than what Amazon sells it for. That's just the first link google spit at me.)