Original Plumbing is a relatively new magazine created within the last year by FtM trans guys and is all about the sexuality and culture of FtM trans guys.
There are two issues out so far: Issue 1 - The Bedroom Issue - Fall 2009 & Issue 2 - The Hair Issue - Winter 2010. I own a copy of both issues and they're both amazing. You can order them online through the Original Plumbing website and they can also be found at select local and independent bookstores around the country - there's a list of official OP retail locations on the website.
A little more information about OP off the website: Original Plumbing documents diversity within trans male lifestyles through photographic portraits and essays, personal narratives and interviews. We feel that there is no single way to sum up what it means to be a trans man because we each have different beliefs, life experiences and relationships to our own bodies.
There's really nothing else like this magazine out there. Check out the website or pick up a copy when you can, and support the amazing and dedicated creators of this important project.