Also for those of you not aware of the great work Mike Pall has done on LuaJIT you should really look into it. He's done amazing work virtually all himself. Please consider donating to the project to help fund and support Mike.
Mike offers all of his work under a BSD license so the community can freely, without restriction, use his research and developments.
While I agree that LuaJIT is great piece of work, the linked page says Mike is not accepting sponsorships at this time and there doesn't seem to be any way to fund him.
The best way to contribute to LuaJIT seems to be to learn its internals and make contributions, or to fund somebody else to do so. Mike encouraged this when he gave a talk on LuaJIT in Zurich last year. His own commercial ambitions seem to be already satisfied at the moment.
Also for those of you not aware of the great work Mike Pall has done on LuaJIT you should really look into it. He's done amazing work virtually all himself. Please consider donating to the project to help fund and support Mike.
Mike offers all of his work under a BSD license so the community can freely, without restriction, use his research and developments.
http://luajit.org/sponsors.html