TiHardtail
Dirt Disciple
My 2 cents (pence for you Brits). There should be a "retro-cyclocross" or at least a subsection within retro road bikes. I'm currently riding a 20 year old CX bike made by Gunnar. Steel frame, fork, and rim brake perfection. Compared to modern road and cyclocross bikes, it's definitely retro. Additionally many of the now vintage mountain bikes we so love, those manufacturers also made a few CX bikes. 
