I always wipe cache and dalvik cache when flashing a new ROM. No need to factory reset or format mounts though.
For those who want to stick with this build, you can fix the deckclock alarm by swapping the older build's DeskClock.apk, I wrote instrutctions here:
xda-developers - View Single Post - [ROM][WIP][ALPHA] aospCMod | AOSP 2.3.4 / CM7+ (Gingerbread)
To use the camera, open it and press your menu button, then select Advanced Options, uncheck everything, then check one or more of the snap picture using volume up/down or search buttons. You will not be able to use the special pre-focus, but you will be able to take pictures.