I'm having trouble getting 4.2 to work. I have modloader on mine, I deleted META-INF a while ago, and all my other mods work fine, but every time I download ultimate fist, it gives me a black screen when I try to load my game. I was hoping I could get the item ID so I could see if that is why it isn't working. Also, if there was another solution, I would be glad to wait for it.
I use this mod, in fact it's one of the most vital mods I have; without it I literally could not play the game. I was waiting for an updated version to come out before I upgraded to Minecraft 1.3. The front page seems to imply that it is, since it says Update 4.2: 1.3_01 Now supported!
...but the mod's creator doesn't seem to have posted anything within the past 11 months saying if that's the case. Fortunately I have a friend who already has the current game, and he did some searching and found this page for me: http://minecraft.de/showthread.php?41371-1.3.2-UltimateFist-%28Update-31.8.2012%29-Multiplayer-255.555-Downloads
Problem is, that site is entirely in GERMAN. I'm not sure how well Chrome will translate the download instructions, but my friend tried it out & said it worked. (At least I think he tried the mod from that page; he might have tried the file from this page, I forget.)
I have no idea if this mod has been updated in this thread, I might try the file myself soon (I'm in-process of upgrading my game now), but to the rest of you who want to have The Ultimate Fist in Minecraft 1.3, you can try the German site.