However, here are a couple of things from a quick google search. See the Daily Princetonian, in May of 2002:

While getting a man pregnant is not quite as easy as impregnating a woman, it is technically feasible...the embryo would be implanted through a laparoscopy in the man's abdomen near the omentum, a fatty, blood-rich tissue that hangs in front of the intestines. The baby would be delivered at term via Casearan section.

Lori Andrews, author of the above article, characterizes the research on primates as rumor although I've seen other sources that support it as fact. Andrews also states that a prospective pregnant male would first need to be prepped with female hormones; but other research proves that to be unnecessary.

Omni Magazine did a story about all this stuff in 1985. And, although it was a pseudo-science journal, it nevertheless used pretty accurate sourcing in their article on the subject of "Male Pregnancy":

In a series of experiments in the early Sixties, for example, Dr. David Kirby, of England's Oxford University, transplanted mouse
embryos into the testes, spleens, and kidneys of adult male mice. Kirby got the best results in the testes, where one embryo developed in "perfect condition" for 12 days, about half the normal gestation period for a mouse. Kirby, now deceased, theorized that the testicle capsule was simply not elastic enough to allow the embryo to mature fully. The experiment did show, however, that testosterone and other male hormones found in high concentrations in the testes do not thwart normal embryonic development; positive sign for those males who want to have babies.