Quick Tip: Create an App Stack
One of Leopard’s most popular, and certainly controversial features, is Stacks. It allows you to quickly see items in a folder placed in the dock. But I think we have not thought of the more clever uses of Stacks yet. This little tip involves a Stack, and our friend, iWork (or your favorite application suite), and can be used to group similar apps together for easy access.
Try this with one of your most used software suites or a group of programs that fit within your workflow. You might also try placing all of your favorite system utilities in a folder and making a Stack for that. The process is really simple.
1. Create a new folder with the title of the group (Microsoft Office, CS3, webdev).
2. Create aliases of all the applications you would like by right clicking them and selecting Make Alias.
3. Place each alias in the new folder.
4. Place the folder in your Dock.
5. Unleash The Stack, and enjoy!
Now only if Apple would allow us to use custom icons as the stack icon.
Via WebBake.

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Brilliant help. Thanks!
[...] App-ify it! with a quick tip [...]
“Now only if Apple would allow us to use custom icons as the stack icon.”
http://t.ecksdee.org/post/19001860
great minds think alike?
Uh… you can use custom icons in stacks. Just change the icon of the folder that the stack represents, right-click the stack and under “Display As” choose “Folder”.
Personally, I prefer the cute little stack drawers, though.