Linux BitKeeper to CVS gateway announced by Larry McVoy. Intended for developers only due to bandwidth and CPU costs. Even more useful (if it gets hosted) is RESTy access to GNU patches of changesets.
it was only recently that I realized that because BK is not free software some people won't run BK to get data out of BK. It may be dense on my part, but I simply did not anticipate that people would be that extreme, it never occurred to me.