Well, my next CCIE R&S renewal date is coming up in May, so I've decided to start my trek through the CCIE Voice. For now, I'll be focusing on the CCIE Voice Written to meet the immediate need of not allowing my CCIE to expire. Maybe I'll look at the lab exam after that... Although, I didn't have any kids when I got my CCIE R&S...this may take a little longer...
So - here's what I'm finding for CCIE Voice study (not much):
CCIE Voice Exam Quick Reference Sheets (Cisco Press)
CCIE Voice Book List (Cisco)
CCIE Voice Written Exam Blueprint (Cisco)