Saw this over at digg.com..
A new male contraceptive that is actually reversible, fairly non-invasive, and non-hormonal is being tested in India. Basically, a gel is placed into the penis, which slows the ejaculation of sperm, but doesn't block ejaculation. This gel can later on be dissolved easily, reversing the contraceptive.
I think this is pretty exciting, probably over this century there will be lots of new developments for male contraceptives, which is definitely a good thing. The options for both men and women now are frustrating. I don't think it is a very good solution for women to take hormonal-based birth control, which can do all sorts of things to their bodies, and men lack any reproductive control short of a vasectomy.