Physical keyboard is changed to QWERTY after CyanogenMod 6 flash. if your HTC Dream has an AZERTY keyboard:

• Download http://www.mon-cobaye.net/vrac/modif.zip (see SPF forum post)
• Copy trout-keypad-v3.kl and azerty.kcm.bin to your sdcard
• Then run the commands:

adb remount
adb shell
cat /sdcard/trout-keypad-v3.kl > /system/usr/keylayout/trout-keypad-v3.kl
cat /sdcard/azerty.kcm.bin > /system/usr/keychars/trout-keypad-v3.kcm.bin

• Then reboot your phone

Some doc: http://source.android.com/tech/input/key-layout-files.html