Radioshack is a good source of LED's and other small electrical parts.

As for rewiring it, if you look on the board there will be really tiny LED's that you can just take and wire them from. You may need to take the power off the battery and have the opposite wire connect to the board so it can power it and have the board control it.

/wish I had an iPod
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop