I have a smaller mod, using two computer CPU fans. I bought it on ebay, about $15.
Sold by seller "rflkt1".
Here's a link to the photo.
This setup worked great for about 9 months, at which time the fans started getting noisy. I inquired with the seller about it, even though I've got no recourse, he offered to replace it. Instead, I bought 2 higher quality ball-bearing fans and put those in the same location.
The fan (IMHO) helps the fridge reach cooled off temperatures more quickly. It also helps decrease ice build up on those fins. This setup in stock form pulls like .15A, so it's not much power and works off the power that runs the fridge light.
I don't think this is better than Murphie's solution - it might just be easier for those who aren't so fabrication oriented.