Comment 28 for bug 183368

"The media icon and gmail applets all have in common the fact that the desktop file has a different name than the directory the applet files should be in. I think renaming these might fix this."

ah... good eye.

One of the requirements of the new build system is that the desktop file name match the dir name (and obviously the Exec and such in the file need to be modified also). It may seem like an inconvenience but I actually tend to think that enforcing this match is probably a good thing.