This app is a must-have utility for everyone. It resides in your menu bar and after an easy* configuration, you've got your apps neatly sorted into functional categories. I have a fair number of photo apps and Start allows me to create categories inside the main "Image" category: Editing, browsing, filters, f/x, DAM, Utilities, and Gallery. Since many photo apps are multi-functional, an app can be added to different categories.
The cost is much less than what it's actually worth if you have a number of apps that you use only occasionally and hate scrolling through the /Applications folder looking for something whose name you might not recall.
This update with the ability to add comments and to hide all uncategorized apps makes it even better.