The shelves are looking good!
As Cobotron stated you can get the LED lighting for shelves or cabinets from Ikea. I bought a set of Dioder lights for my Detolf shelf.
Although the Dioder sets I bought were 4 strips not pucks? The strips can be run from the power supply individually or they can be daisy chained together to make one lone strip. The good thing about this set is that the length wire for each strip is about 5 or 6 feet long so you can get creative with routing it on your shelving. The plug wire is pretty long also so you can get fairly far away from the receptacle...
Best of luck on what ever route you go, will be nice to see pics of the shelves lit up
