So simply said: nothing that is of importance if you want to be productive as Grey Alien surely would agree (he sold and sells several BM games, Win/OSX PPC-X86)
First off, no offense is meant to Grey Alien here, however him and GFK are merely big fish in a little pond. having two people out of 3118 registered users (a few being BRL accounts, Banned accounts, and general users that never visit or even use any BRL products anymore) is in no way stating that the products are capable of producing GREAT results.
Secondly the fact that Grey has found that little niche of merely adding more content and repackaging a product with a different name speaks a lot. This is in no way representative of his skills, just his marketing ability, and in that I give him kudos, but to merely make "<insert name here> Bonus" with new content or a slight variation of gameplay from the previous "<insert holdiay name here> Bonus" also says nothing about a language's greatness.
Again, Great job Grey and GFK with your abilities and how you have done for yourselves. But two people taking something mediocre and molding something good out of it doesn't mean everyone will or can or even should. I really enjoyed B3D, and I really dont want this to turn into a B3D vs <insert language here> debate, and I really don't want to hold onto the past. B3D was a fun experiment, moving on now....
So I revert back to what I said. Blitzmax is ok..... I wouldn't choose it professionally, and even then I would only use it for quick and dirty testing if need be, however outside of that I just don't trust it and the very unstable future it seems to have (or the lack of what Mark really wants it to be as he keeps changing his mind).