A place in Vancouver called pixel print. If I recall they are just a 18 pin machine IC socket (Dom - correct me if I'm wrong). You can get them from a number of electronic supply places.

Got mine from eBay 24 pins (wide one).

Yup, that's right, but they are 24 pin. Type this in on ebay:
5pcs x 24Pin IC Socket (Machine tool) ROHS Best Quality

There's a listing there right now and it ends up about $5 for 5 sockets and it's in Vancouver, so you won't wait 8 weeks for delivery from China.
I've seen some guys cut the legs off, but if you get a small little nail punch (and a pretty little flower covered hammer :D ) you can just punch them out easy enough.

So I bought new PCB boards with the drop down resistor to prevent the LED's from going full 100% if the board looses the pwm signal. Thanks to Scubasteve for that modification! I'm sure this will save many a coral from being baked.
But, that also means I have to de-solder all my old boards and resolder everything on the new ones... wheeeeeee!
Here's the new baord and the start of soldering the drop down resistor:

http://i1177.photobucket.com/albums/...ps82c5b530.jpg

And if anyone doubts the teeny tinniness of these resistors:

http://i1177.photobucket.com/albums/...ps711c2599.jpg

All the resistors in on one board and the dip sockets:

http://i1177.photobucket.com/albums/...ps365870b7.jpg

And with the terminals and jumper pins soldered in:

http://i1177.photobucket.com/albums/...ps3e8fdd63.jpg

is there a way to add a potentiometer to this?

Sorry of this is a stupid question, but add a potentiometer to do what?

To manually control the brightness of the LEDs rather than going to the software.

I was confused too but now I see...

With these particular drivers, no. The LDD drivers are controlled with a PWM signal rather than a 0-5 or 0-10V source. If you got a simple IC, like a 555, you could add a potentiometer to that to vary the PWM signal to the drivers. It's not difficult to implement if you want to forgo a controller. There are simpler controllers than the Jarduino if that's what you are looking for. I use a Typhon but will hopefully be experimenting soon with a cool new controller that Spencer at Blue World Victoria is working on.

It's OK now. I just add another screen for individual LED brightness and save it to eeprom.

Glad you got it figured out. I'm out camping and doing this on my phone with my big dumb thumbs :)
Trying not to have to put long posts up, lol.