c-repl, in case you've forgotten, is a read-eval-print loop for C. I rewrote it in Haskell earlier this year and added a bunch of cute features (tab completion of identifiers in scope!), but got blocked for releasing it on a limitation of Cabal, the Haskell packaging system. But that's silly -- even without a nice "install" step it turns out I still use c-repl all the time; it's surprising to me how often I have a question about some header or library that can be trivially answered by dropping into a c-repl shell. The home page has a little demo of the sort of things it can do.
So go try it out and let me know what you think! (This post was in part the result of seeing the announcement of Language.C, which I'd love to make use of.)