I guess that the program I've used the most on any of my Palms has been HandyShopper. This is a FREE shopping list program that, actually, can be used for anything you want to make a listing for.
Here you see part of my shopping list. The items with bullets at the bottom are all the items on my list. When I hit one with the stylus, because I need to shop for it, it automatically goes to the top of the list and I've set it to show a check box. As I shop I just hit the check box and the item disapears and goes back to its alphabetized place on the list.
As you can see there is also a column for quantity and price, if I want to track prices. You can set up other columns for Priority, Icon, Category, Custom Test, Units, Aisle, Unit Price, Coupon, Taxable and Date. There are several viewing options and many sorting options. Notice at the top that the database says Food. If I wanted another list I would just start a new one with another name. You can also export the list to Memopad for backup or for transferring to another machine. You can, of course, import from Memopad. There is a built-in calculator and too many other features to mention.
HandyShopper is available from Palmgear and there is a website about it HERE. By the way, there is a version available for the Pocket PC.