Aluminum foils is safe to put into a regular oven but it's not safe to use aluminum foil in a microwave oven.
I use Aluminum foil all the time in my oven and have had no problems and in my opinion Aluminum foil tends to keep the heat in and cook the food better than tin foil.
Stores around here sell disposable Aluminum Roasting pans as well to cook food in the oven with.