You can not combine/stack any kind of WDW discounts. If you are booked under a pin code and a better code comes out that you want to apply to your reservation, then yes, you must give up the pin code discount.
If you booked using DVC points you are not eligible for free dining or any other Disney resort discounts. If you book a Magic Your Way package through Disney at one of the DVC properties, then, yes, you can apply a free dining or room only discount.
No, DVC owners are not eligible for free dining or any other resort/room discounts from Disney. Disney has their business no matter what, they aren't giving them extra discounts on top of their DVC ownership. Free Dining is probably the reason we won't ever buy into DVC or even rent points. For a family our size, I believe, it's a minimum of a $25,000.00 buy in to get a villa the size we need. I haven't hardly spent that much money in 7 years worth of free dining trips. And as for renting points, it's double the cost of our vacation, as opposed to staying in 2 connecting rooms at a value resort with free dining.So DVC owners are not eligible for fd? I thought there was a way for them to still take advantage.
oh well, I guess I like my hunt for a good discount. 
Yes, you must run the numbers. But if you are staying at one of the Villas and booking through Disney, or you are staying at a deluxe resort, a 40% off room code is going to probably be a larger discount than a free dining discount. If you are staying at a Villa or a Deluxe resort and your room discount is 30% or less or all of the people in your room are considered Disney "adults," then the free dining discount is probably going to be greater.Oh... well, that weighs the scales a bit. See, I look and look at the numbers and DVC always seems to not be a good option for us. We always go on some discount and rarely stay in more than a value. This last time though, we stayed deluxe and I wondered if maybe dvc would have been better to have. Dh really is the one would probably will only stay deluxe now and he actually was the one to seriously suggest DVC. But... I assume that you could get free dinning.
No, you shouldn't. You are just modifying a reservation and you are doing an upgrade - Disney doesn't charge you for spending more money with them, even if you are inside of your 45 day window. We have changed resorts under a free dining reservation twice and I didn't have any issues. There have been people report here on The DIS that a CM told them they could not do that, but that is incorrect information. If the CM who answers the phone can't help you, just ask to speak with a CM manager and they should be able to modify your reservation without issue.
The CM would have to check for availabilty, that is true. If there is availability, they should be able to change resorts without issue. The CM isn't going to change or modify their current reservation until they have verified availability at WL.
All of the free dining dates that were released for 2011 are listed in the first post of this thread - is that the info you are talking about?
You're welcome!Thanks for keeping all this information up to date!
