I managed to get Gaim to work, but not any other movie player.
To properly install Gaim on the C3000:
1. Follow the procedure as directed by the website. You will know the instructions were properly followed if you get Gaim to open, with only some dividers in the menu bar and no graphics.
2. Perform the following commands in the terminal:
ln -sf libpng.so.184.108.40.206 libpng12.so
ln -sf libpng.so.220.127.116.11 libpng12.so.0
ln -sf libpng.so.18.104.22.168 libpng12.so.0.1.2.5
3. Start Gaim. You don't have to repeat these steps every time.
I've experienced a few significant bugs with Gaim. Firstly, I've never had any luck bypassing the "Buddy not found/unable to edit buddylist" error due to removing a buddy from the buddylist on a different computer. Also, it doesn't respond to network status, so resuming from suspend back onto a wireless connection doesn't guarantee that you've reconnected online.
Note, the command line step was drawn from the second to last FAQ question at http://qpe-gaim.sourceforge.net/
I think the main problem with movie players for the C series models is that each player looks for the W100, an ATi graphics chip that isn't present on the C3000. Since the code that accesses that actually manages that card isn't inside the program (rather, the program talks to that code), the error doesn't propogate to the user and is instead handled by low level ignorance. That is to say, Linux just drops the error and doesn't care.