Hi, I've here a similiar problem. After rebooting a 2.6.32-5-amd64 machine with raid1 grub wasn't able to boot the system. Last Messages where like "Welcome to grub" and then falls back to "grub rescue>" shell.
I've booted with a squeeze installer cd into rescue mode and found out that installing grub onto /dev/md0 solved my problem. Retesting this with dpkg-reconfigure grub-pc I've choosen sda and sdb to install grub and the system wasn't able to boot again. Doing the same dpkg-reconfigure grub-pc and choosing /dev/md0 (which is also available) makes my system boot again. For now I'm unsure if I also should install onto sda and sdb. I'll stick to /dev/md0 only and will test if I can still swap sda and sdb to boot successfully. Hope this helps someone. -- greetings eMHa
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