Good:

• Nutritional database linked to ingredients
• Individual serve scaling
• Logical shopping list feature
• Filter by category

Bad:

• Fairly unattractive interface
• Individual serve scaling is temporary and doesn't show up in main recipe window
• Lacks more advanced filtering/classification
• Not obvious how to add recipe ingredients to shopping list (although it's there)
• No weekly meal planner
• Shopping list doesn't remind you which recipes you've selected

Shop'NCook is one of the better recipe programs I have tested. I would probably rate Connoisseur and A Cook's Books higher, but only just and for different reasons: Connoisseur is less feature rich but has the most user-friendly interface, and A Cook's Books has the most features. Organized Gourmet is another good option if meal planning is more important to you.

The programs I tested, roughly in order of preference were:

1. Connoisseur 1.1.7 (great interface)
2. A Cook's Books 0.9.19 (feature rich)
3. Shop'NCook 3.1 (includes nutritional database)
4. Organized Gourmet 1.2 (calendar based meal planning)
5. MacGourmet 1.1.7 (attractive interface, includes wine notes)
6. iCuistot 1.1.1 (includes nutritional database — sort of)
7. Kitchen 1.0 (simple interface)
8. Yum 0.7.8 (simple recipe manager)
9. Measuring Cup 1.1.1 (simple interface)
10. CookWare Deluxe 2.1 (includes a very basic meal planner)
11. The Computer Cookbook 3.1

Note: There are many others that I didn't test at all because they looked less promising, based on their descriptions and other people's reviews. There is one commercial product (TheRecipeManager) I refuse to test because of the developer's crazy policy of buy before you try. While I have tried to give a fair and honest appraisal of each product, I don't pretend that each review is exhaustive or totally without error. If I have overlooked any feature, it's possibly an indication that the feature was difficult to find or unintuitive to use — so in any case the reviews are a valid record of my opinion and individual experience.