The Winternals ERD commander is still alive and well under Microsoft but you need to go through a couple more hoops to get it. It is now part of Microsofts Desktop Optimization Pack and is only available through a few methods. You need to have purchased Software Assurance AND the MDOP licence that gives you several benefits including the new ERD distro. Alternatively if you have technet or a MSDN subscription you can get the software for evaluation purposes too.
Search your Technet/MSDN downloads at technet.microsoft.com for Desktop Optimization Pack and download.
For what it's worth, the tool is very good at recovering data in the case of a missing Boot loader or virus or something else mangling the system.
Another useful tool that you might have seen and that is partly related is the ZALMAN ZM VE200 SATA hard drive caddy. Add your hard drive with all the iso's installed, and then attach the drive to your machine, select the iso you want to boot from with the jog wheel and boot away. Note that I don't actually have one yet but I have seen it in action. A good review with some hints and tips for using it is at http://www.rmprepusb.com/tutorials/ve200 ($43 at newegg - http://www.newegg.com/Pro...aspx?Item=N82E16817379025 ) (Note there is also a USB version at $55 but thats out of stock)
Hope this helps.