I'm working on bitx.  You can follow my (slow and leisurely) progress at the fossil repository (http://bitx.appamatto.com) and my blog (http://appamatto.com).  Once that's done, I'll work on either the bitcoin on bitx implementation or on bitCA, which seems to be the better way of doing DNS and related services.

I think theymos/nanotube are working on their proposal as well.  There are probably other proposals that don't require additional block chains or changes to changes to bitcoin proper, but even then it seems a little to early for finished products.