I love making big batches of cooked ground turkey which I then either season for soup/spaghetti or tacos. Obviously this could also be done with ground beef, I just prefer using turkey. Once it's cooked and cooled I portion it out and freeze it. Then I can easily take it out and throw it in the microwave to defrost in just a few minutes.
used to do this allot when we were both working and the kids were young. now i still do it for 'taco meat'-small plastic containers that i fill with taco seasoned cooked ground beef. this is a throwback to when i got fed up with too many fast food purchases. i started thinking about the most common items the kids would ask for/order and realized taco bell was at the top of the list so i started making batches of taco seasoned ground beef and keeping a supply of taco shells, flour tortillas, canned refried beans and taco sauce on hand. when i discovered the 4 packs of individual microwavable nacho cheese sauces our menu expanded to include nachos

i used to do massive batches of plain ground beef about once per month-such a time savings on work nights what with pasta sauce, sloppy joes, stuff that could be thrown into the crockpot with it in the morning...