I can them right along with the red ones - if you want it to look fabulous, alternate layers of red and yellow. (I always put 2T lemon juice in my canned tomatoes....)
I used them just like any other tomatoes - sauce, salsa, or just tossed some in the freezer for later. With 2 little kids I don't have much time for canning right now.
Yellow tomatoes have lower levels of acidity than typical reds. You may want to add 3 tablespoons of bottled lemon juice per quart to up the acid level for canning. You can also use citric acid or vinegar.