Does anyone know if there is any place where I could order pre-made Haskell t-shirt that benefits haskell.org too?
I don't know where, but I just wanted to say thank you to both you and Ryan and everyone else who buys one. Setting something up like this is great! And we definitely want to encourage it. So if you do find a place to order shirts (maybe cafepress?) please let us know.
Gershom announced it at the recent Haskell Implementors Workshop and we're still working on getting the word out to a wider audience. In the future, haskell.org would like to use donations to buy dedicated development time for key bits of Haskell infrastructure. I think we'll have more to say about that in a week or two (work in progress).