That may not completely be the answer... Mono may do it, but there's no real status on how well Mono runs under AIX.
I think the real question is WHY would you want to do that? Why not use PHP, Perl, Ruby, or something else that is better suited to that environment?
Well we want the web server to be in AIX. With regards to other pgm language we still need to train people. They only have .NET trainign right now.
Thanks for the help anyways.