I've had success getting Uneek+DI to boot before when using the full ModMii wizard. I couldn't get anything to work though unless I did a powercycle, so I figured that my problem is a slow hard drive, so this time I followed the compiling guide so that I could add in the "udelay" that you posted in the hard drive topic.
Could you describe this a little more in detail?
Maybe you could try with another harddisk or usb stick to see if it boot's with that?
I am unsure if uneek compiles well with the latest version of devkitpro.
I vagualy remember people telling they needed to revert to an older revision of it.
You could try a sneek setup with your own compiled modules. If that works, your devkit version and the way you compile things should be fine.