I feel like I've been seeing Racket come up more often recently. It's interesting to me that it seems to be winning the scheme wars when there are other excellent distros out there (such as Chicken and Gambit). Has anyone shipped any software with Racket? I'd be curious to hear about it in real world scenarios (e.g., long-running processes and deployment).
The Racket website at racket-land.org is served by Racket [and mostly written in it, too]. HN is [or at least was] written In Arc and Arc is/was written on top of Racket [or one of its predecessors].
If Racket is winning it may be because its ties to acadamia provide a stable working group who can work on it as part of their day job and a constant stream of grad students who implement their work in it.