I just finished setting up w7 build 7000 and 10.5.6 dual boot using easybcd 2.0 beta floating around the forum.
The main issue with this is that extension.mkext on EFI Partition is unusable so I had to install all the kexts into System/Library/Extensions loosing my totally vanilla install
This program will reinstall pc_efi_v9 for MacosX bootloader too.
by looking at my bcdedit list, the path for macosx is /NST/NeoGrub.mbr with /NST/nst_mac.efi file in that folder. I can post that folder for you to try or you can bypass all that and use easyBCD 2.0 beta.
Last night I decided to wipe the partition I'd used to install from as I'd like to also add Ubuntu to my NC10 for a quad boot! Unfortunately when I rebooted my system I see the Operating System not found message and while I can get around this with an F4 at the Samsung loader, it would be great to go just to the multi-boot selection screen as it was previously. Is there some way from within either Mac, Windows (have xp and 7) or even the bios screens to tweak this?