I don't know how many on my friendslist would self-identify as transhumanist... (and folks in the transhumanist community likely already know about it?) but there is now a magazine. H+ -- as any professionally polished magazine of its age, it's published a fair amount of information I was already familiar with (even out here on the inner fringes of the fringe). But part of their goal is to spread transhumanism, make it a house-hold word, and they've got a good product for that. And it's free.

http://www.hplusmagazine.com/. Don't judge it too harshly by the cover (if you would). It's not that plastic/lifeless inside--far from it.