And lets not forget the depo shot which can cause infertility, osteoperosis (especially if used for more than 24 months (at cumulatively)), and make your nipples leak blood.

Edit: Oh... I forgot: reduced sex drive and it can also trigger extreme mood swings or depressions.

"Don't worry baby, I'm on the male pill," is the new, "Don't worry baby, I'll pull out."

Aside from that, I think it's a great idea, but only in long term relationships were you can monitor his pill taking.  ;D

I intend to posit that there is only one reliable birth control method.

Castration.

Only if you eat them in utero.

I would definitely use, provided:
1) High reliability
2) Acceptable side effects
I've always found it somewhat amusing that a contraceptive would have among its side effect a decreased libido, which has been one of the problems with previous attempts at a pill for men(and yes, also a problem with female hormonal contraceptives). But if this works well I could rest easy in the knowledge that remembering the pill was my responsibilityl. Mind you, my hypothetical partner might not feel the same way 

Mm.. no, sorry, I don't get it. My body (and I am female, in case you live under a rock ) creates hormonal signals. Because of them, an egg ripens. The pill I take blocks/confuses those signals. No fertility.

Mens' bodies create hormonal signals. This pill would block/confuse those signals, and no precursor cells would divide into sperm.

There's no real difference, hormonally, between blocking/confusing a signal that only gets sent once a month or so, and blocking/confusing one that is sent much more often. It's hours or days for each precursor cell, I forget which. if the hormones that cause gametes to form are like wireless signals from one device to another, the pill functions like a huge powerful emitter which drowns out the first device's signal in static and noise, or overwhelms it by broadcasting a conflicting signal. Now, if the pill's static is always there, chemically, it doesn't matter much if the device sends its signal every month or every day.

Damn right. My sperms are so powerful that when I ejaculate I can sink aircraft carriers.

Anyway, Phobo's concern may not be based on rock solid science even despite his reference to X wing starfighters, but it makes sense as far as it goes... I can see the concern. Of course, the actual release of this pill will no doubt be accompanied by a truckload of science to dissuade us fence-sitters.

Anyway, Id definitely do it, provided I don't have to have an injection directly into my penis every three months, which Im sure was the case for the other one, if not the same pill...

I was talking with one of my male friends and he had a few concerns about the male pill.
1. That because the pill reduced sperm production that orgasms would be weaker.
2. That after a week, a guy would think he was safe.

Besides, one of the main reasons I'm on the pill, aside from the birth protection, is that it regulates my period and lessens cramping pains. I also wouldn't really trust a guy to remember to take it, no offense to the guys here. And then a guy could -say- he's on it, the girl would believe him and wham! another stupid baby is born...

Its just my opinion that guys would forget to take it as well as a girl. I know I forget on occassion but I also always use a back up method. And as for saying and not doing, I think ninewhilenine said it best...
I'm also not a trusting person, especially of guys, and rather paranoid when it comes to sexual protection. I don't want to end up like my mom, and she used protection just not a back up.

I just personally don't trust a guy to take a pill. I know all guys aren't like that but still, I wouldn't trust a guy to remember. Its just how I am so I would never rely soley on the male pill or even as the male pill being the only back up. Maybe I'm being a jerk, maybe I'm over-paranoid but its just how I feel.