In my last post on improving the state of Cisco certifications I suggested Cisco release "study" IOS images for the Dynamips router emulator. I've talked to a number of people with varying levels of experience with Dynamips and its enhancements, Dynagen and GNS3, but I'd like to get a better feel for just how prevalent they are in the community. I've included a poll here that will run for a week; please vote! If you have additional notes, feel free to leave them in the comments.
If you find yourself having no experience with these tools, I want to encourage you to check them out today. There are a number of tutorials on Dynamips and its hypervisor, Dynagen, available with a quick Google, like this one by Greg Anuzelli. You can even find a great batch of Dynamips video tutorials over on Blindhog.net. I recommend also installing GNS3, as it provides a very handy graphical interface for laying out virtual connections between devices.