Internetwork Expert – IE is bringing back the proctored Mock Labs in September. The price is $149 (about $100 cheaper than they used to be). I’m probably going to give one of these a shot.
PacketLife– PacketLife has a great introduction to DMVPN. If that whets your appetite and you have a few free hours, you should surf over to Internetwork Expert Blog and read Petr’s magnum opus on the same topic.