I've put in a few months towards this test. It can go one way or the other. Its a freebie, so I'm going for it.
CBT nuggets
Cisco Press
Various Customers Call Managers

Update I passed. I got a 847 on the test. Not as hard as I thought, but I could have done better in a few areas where I didn't' have no idea what the answers were. Onto CVOICE.