It seems like it would be a good idea to start a thread (which can be sticky if it gets enough use) whose sole purpose is to list whether accessories are iPad compatible. No reviews or discussions just a simple list. I would suggest the following format:
Link to review:
I think the first 4 are pretty self-explanatory.
Type would be case, charger, car charger, dock, etc.
Compatibility: stick with yes/no if possible. If mixed compatibility, keep it short (i.e. Yes but won't charge while using)
Link to review: Either an external review or a link to your own review on the forums.
I'll start in the next post.