here's how to freeze a quart of blueberries for the winter. this is also the best way to freeze just about anything that could potentially stick together if placed in the freezer at room temp and all at once::
spread them on a pan and stick them in the freezer. wait until they are solid and then dump them into a container and put them back in the freezer. done and done! i freeze my pancakes like this as well and then seal them as airtight as possible. they freeze beautifully. and sometimes, in the middle of winter, after a long day of work, pancakes for dinner are a wonderful thing.