Welcome... Im new HERE as well, but have been using the PBC for about a year now so I think I can answer a couple of your questions. As far as freezing meats goes, I don't think you will notice much difference as long as you thaw it properly (not in the microwave). It may take some extra planning, but letting things thaw in the fridge shouldn't effect quality much at all. As far as Tritip goes, I live in Kentucky and cannot get it in any of my supermarkets here. I have yet to cook one, however if I was planning to, I would visit my local butcher and I'm sure he could procure one for me within a day or two. As far as posting pictures, im not sure... I notice on my first post yesterday there was a little photobucket "app" at the bottom of the box. I went ahead and registered for an account on photobucket and am going to try to upload some recent cooks I have done this morning.
Enjoy your Pit Barrel! It really is amazing the simplicity of the process and the quality of food it produces. If you have any other questions, feel free to give me a shout!