Freezing cookie dough
Keeping some frozen dough on hand means you can bake just as many, or as few, cookies as you like without having to whip up a batch of dough. Form the dough into balls and arrange them on a sheet pan to freeze. Once the individual balls of dough are frozen, place them in a zip-lock freezer bag and store in freezer. When needed, take them out of freezer, just the amount you need. Place them on a cookie sheet and bake. They will take a few minutes longer to bake than if they were not frozen.
Keeping Cookies separate as they bake.
Many types of cookies spread as they bake. If cookie dough is placed too closely together, they'll run into each other when they spread in the oven. To give each cookie a little extra space without severly limiting the number of cookies baked in a batch,, instead of placing them in neat rows of three or four so that all the cookies line up, I alternate the rows. For example three cookies in the first row, four in the next, three in the third, and so on.