Yeah, and the high-end multimedia authoring tools, and database engines. Ironically, all of these need every drop of performance you can squeeze out of a machine so nice, high-level languages like Haskell are off the table and you have to slog through with C++ and low-level threading.

funnily enough, many DB engines are written in Erlang -- a usually slow, high-level language. CouchDB, Riak, Mnesia, Hibari, Amazon SimpleDB, etc. They're not completely off the table.