I've written an application that can be run within the context of the PortableApps menu to display a dropdown list of applications installed in a subdirectory under PA. This will allow those of us who are impatient for the next version of PA to have some category support for now.
Here's a screen shot (read the full post for a link to the software).
Browse to your "PortableApps" folder and create a new folder for your grouped applications (e.g. Games). Move any of the folders in your "PortableApps" folder that you want to appear within the category into the new folder you've created. Also copy in one of the executables included in this zip to the folder (the icon for that executable will be the icon you see). If you want the Category to be named something other than the name of the .exe, you can simply rename the .exe to whatever you want the group to be named (If you name the exe "My really super nifty group.exe" your group will be called "My really super nifty group"
Now when you click on one of those groups, a drop down will appear with the applications moved into that folder. If you change your mind about running one of them, you can click at the bottom to close out the menu.
Also, if you are really fast with your mouse after clicking on the category, the drop down will appear by your mouse rather than by the category.
This is likely to mess up your backups if you do anything other than a "full" backup of your portableApps drive.
Aug 7th- I've made a small update to take the taskbar into consideration when calculating screen size.
Aug 10th- Updated to properly handle the 1.1 Beta Menu (as well as 1.0)
That being said, here's a link to the app with Delphi source included.