I tried Kensington since I went there in march. UPS, FedEx, etc is very expensive, $60. However, we can do normal postal service. That's $12 but it is not tracked. However it does include a "certificate of mailing" which essentially proves that I sent you something (I'd take a photo of that and email it to you). Since I'm selling the prototypes (assembled) at cost ($20) that becomes $32 total. Or we could do other options like a bare PCB board (all components are thru-hole). Or maybe a $20 tracked priority mail; I'd have to check to see if it fits with appropriate padding into the small priority mailing box. Send me an email at g.andrew.stone at gmail dot com and we will discuss.
Hey, I got the boards just fine, and finally got a chance to hook them up at lunch today.
I only ran 5 LEDs off of one IDE cable from each board, but those 10 LEDs looked mighty pretty, flashing and dancing about.
I'll maybe post a pic or two when I get a bit more time--just been super-swamped lately.
Cheers,
Vic
I have got one on hold for me... In a week or two I should have it.
As I was discussing via email, in theory you can hook up 1225 LEDs to a single board by controlling the input with a transistor on each input line (say the columns) and then just controlling the outputs on the rows with the other 35 pins. Then you would use the matrix technique and the wonder of pov to flash the LEDs to light up any that you chose.
Because you are flashing the LEDs and would only have a maximum of one row or column on at a time, you would not draw/sink to the chip more than one LEDs current from each line at a given time.
If you then used some of the pins on the arduino then you could have even more or with two boards you could have 4900 or more. Then coding might then get a bit tricky/boring. 
Unfortunately, that means I need to buy a couple of thousand LEDs
Mowcius
Awesome! 
Love these LED Display projects!
mowcius: Not to mention soldering a couple of thousand LED connections. And you thought the coding might get boring
Here a retailer selling 10 small matrixes for only $13:
I think that they could be connected together to make a larger display driven by the CCShield. For example, you could connect 7 in a row make a stock ticker. That would take 8 for the rows, and 56 for the columns, for a total of 64 outputs, and 448 LEDs.
Or you could do a 3x3 grid (or more if you buy more of these matrixes) which would take 48 outputs and have 576 LEDs
If you look at the circuit diagram (in the spec at the bottom of the ebay page), it looks pretty straightforward to hook up. The "column" pins would connect directly to the CCShield/M5451 lines since they are "sinking" the current (cathode).
The "row" pins are "sourcing" the current (anode), so each one needs a PNP transistor like the 2N2907 -- hooked up in a manner similar to this:
The box with the "8" on the left represents the CCShield and the resistor over there is not needed. This is actually a diagram showing how to do it with an LM334 constant current LED driver...
Anyway, that's my guess! Even though I'm not that interested in making an LED matrix its really tempting to give it a try of just 10 bucks!
Not to mention soldering a couple of thousand LED connections. And you thought the coding might get boring
Yeah I did think of that...
Here a retailer selling 10 small matrixes for only $13:
http://cgi.ebay.com/10-pcs-8-8-Dot-Matrix-1-9mm-dia-LED-Display_W0QQitemZ1204385...I think that they could be connected together to make a larger display driven by the CCShield. For example, you could connect 7 in a row make a stock ticker. That would take 8 for the rows, and 56 for the columns, for a total of 64 outputs, and 448 LEDs.
I thought of that as well but I found this:
10 LED matrices for £5.99 - nearer $10 but probably a lot for postage...
Mowcius
I have now received the LED matrices from virtual village. Brilliant service and they sent it as a gift so I didn't have to pay UK customs charges unlike my package from somewhere else, mentioning no names sparkfun. I have not connected them up yet but I thought people might want to see...
Great buy, I bought 2 packs of 10 as you can see from these pictures:
http://www.flickr.com/photos/mowcius/sets/72157620898562245/
Anyone got any cool ideas of what to do with them now!
Pacman!
An extended game of Pong.
Put together a whole set of classic games! They weren't much more than blocks on a background anyway.
Ok, i'm not quite sure about pacman... How would I distunguish between the different objects? Or were you thinking of the pacman character being 3x3 5x5? Would you flash the led's differently? I would have to distinguish between: the dots, the walls, the ghosts, and pacman all in one colour.
I had thought of:
pong
snake
tetris
mario/a game where you jump over dots and jump on flashing dots (you wouldn't be able to tell that was mario - but it could have sound, now there's an idea!)
game of life (just cos I could)
blockbreaker
I also have a ds touch screen that I may use with the 4 i have spare from a 32x32 grid (4x4) - then I could have touch screen games...
Mowcius