We (or rather OH) tried this last year. It turned out to be very hard work - he got one of those press things off ebay but he had to mix the horse poo with water in a bath to make it the right consistency before putting it in the press. Pressing in itself takes quite a bit of strength (and was very messy, yuk). However, drying was the biggest problem. You need somewhere dry and warm with a good throughflow of air - it would have been ok in summer but we were trying in autumn. We did get some bricks dry and when dry they are very light and there is no manure smell, if anything they smell vaguely of hay. They burn well and burn down to nothing so no mess, but you really need to burn them with something else not just on their own. They certainly do make your fire last longer though.
One downside was that one day a load of flies hatched out of one of the bricks that OH had put by the fire in an attempt to dry it out :redcarded:
I think I'd like to try just drying poo nuggets in their raw form, rather than messing about making bricks. I've read that this works and you could put them in a bucket, just like you would coal. It's just finding somewhere to store and dry it all.
Would be very interested to hear how you get on when you try it.