I'm having this problem as well this morning, though I did successfully install Forge yesterday and played the game. However I was wanting to try Optifine (sp?) instead of MCPatcher, thus I made copies of my mods, save files and texture packs and then deleted my entire Minecraft install, downloaded the latest 1.4.2 copy from minecraft.net and installed the game fresh. I got the latest Forge 6.3.0.364 and followed the installation instructions and then froze at the Done Loading screen instead of the game going forward and setting-up Forge.
I did delete the Meta-inf folder before copying over the forge files and then when it didn't work went in and deleted the new meta-inf folder as well - and got the same result.
I'm not sure at this point what's changed between yesterday and today but the normal fix for the 'Done Loading' freeze error - to delete the Meta-inf folder - isn't working.
