Stupid Finder Tricks: Okay, how do I do this?

[RAMd®d]

I've done something similar to what jdc suggested.

Afrer getting a 2005 folder full of 2005 folders, I put the parent folder in the sidebar, and open each folder in the window, Cmd-A the contents, and drag them into the parent folder in the side bar.

Or you could open all the folders in the parent window, Cmd-A, then Cmd-Click on just the folders to deselect them. Then drag the contents into the 2005 folder in the sidebar.

Yes, a little labor intensive, but it goes fairly quickly.