I feel like riding pigs is slow and annoying. I think minecraft should add horses as another NUETRAL mob. The horse acts like a sheep, lazily roaming around and eating grass, but when attacked, the horse rears up and attacks the player. (or whatever attacked it) Horses could have saddles put on them and be ridden. (just like a pig, the saddle would be the same as well) Horses would travel at two speeds. a normal pace, (somewhere between the player's walking and running pace.) and a fast, running pace. (faster than the player's running speed.)
Horses have already been Suggested. But yes many Minecraft players do want this one baddly, there have been rumors that in the 1.6 update that should come out soon (or whenever this year or something) will have a lot more new mobs. Plus before you choose to post something, look it up, i made the biggest mistake like this before too because people gave me crap about something ive posted.
worths checking out
To be honest I think pigs are enough. They can go faster than steve, and their funny, but I won't complain if horses are added.
http://www.minecraft...orld-version-3/