Hi, I'm trying to convince my father to switch to an iMac. One thing he needs is a good to-do app. It needs to be simple to use, but with the following two features: 1) The ability to categorize tasks, either Nested or in Folders. Tags won't work unless you can display them nested, i.e., Category 1 Task 1Task 2Category 2 Task 3 2) Print overview that will look like the nested, i.e., list each category then the task title. I've downloaded like a dozen different to-do apps in the past few days and can't find anything that has these two options. Right now he just types up a document in MS Word, but he can't handle the auto-numbering and such so he ends up calling me up for help every other day. Showing him a piece of mac software that makes this easy would do wonders. Free/cheap is best, but if its good software but pricey, I could try that. Thanks.