I just created a few video tutorials for dynamips (cisco emulator) and dynagen (the configuration front-end). Tutorials and software are free. All you need is an ios image for a 7200, 3660 or 3640 router.
Part 1 - Installation
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Part 2 - Basic T1 Configuration
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Part 3 - Comms between virtual router and PC loopback interface
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Part 4 - Virtual WAN with Ethernet connectivity
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Josh