I finally got around to doing what I should have done originally, and checked
the Amazon.com entry for TurboTax Estimated Taxes. The great thing about Amazon.com (besides being able to find anything you can imagine) is that the user reviews are generally very reliable. In this case, the reviews are overwhelmingly negative, and one reviewer even pointed out some good resources for taking care of things alone, which looks like it will be pretty easy.
Today I set up an account on
EFTPSgov so that I can e-file on my own, for free mind you, so I probably won't bother with the other TurboTax products ever again.