If it won't boot, why not flash it over to RD mode?
Try boot your Debian using M-AG's Ubuntu Kernel if this debian won't work. SHOULD do the trick to at least get a boot.

As for Multiboot.
Just use ANY xxx.item file and just test with any kernel.

Please post up all the steps you have done so far.

Guru Meditation is because it can not find a kernel.

Make you file*.item in /etc/multiboot


Edit:
Looking over your messages again...
It does not matter what Maemo PR you are on.

Why are you putting a kernel there??

Place the debian kernel you are using in /boot/multiboot
and name is as vmlinuz-2.6.28*blahblah

I have done a few things like this when bored, I will help.

But really, try MAG's Ubuntu kernel first, or even possible try:

take all NITDroid files from partition two (SAVE THESE!) and extract the Debian tarball into P2 and try boot (using droid kernel) see what happens!


Mini Edit: That item file you made was also for BootMenu, not multiboot (check your source)