I was able to update to 10.7.4 pretty flawlessly. The only weird thing is that when I boot, it gives me a bunch of ?kxld? error notifications. It doesn't seem to affect anything, though. Lion works just the same as it did in 10.7.3. I updated by using the apple 10.7.4 combo update, and then replacing the mach_kernel and something like AppleFileSystemDriver.kext from 10.7.3? I'm at school right now but I'll check it to see what I did when I get home.