There are a few sets of instructions floating around the Internet on how to run ESX or ESXi inside Workstation 6.5. (Let me Google that for you or just go to xtravirt) Lots of reasons you’d want to do this — for training, testing, lab work, demos, POCs, or even just as a parlor trick to impress your friends. You’ll need recent hardware. Now David Davis has published a nice 14 minute video tutorial on the topic at Petri IT Knowledgebase. Link: Running VMware ESX 3.5 and ESXi in Workstation on your desktop PC.
Site Recovery Manager can be hard to evaluate — you need some shared storage that is going to be replicated and then set up SRM to do all the tricky failover workflow bits. Tomas Ten Dam has laid out a process to set that up in Workstation as well using the NetApp ONTAP simulator: SRM in a Box final release (the complete setup) « Ten Dam. (Looks like you need to be a current NetApp customer to get your hands on it. You should also be able to do this with the EMC Celerra simulator, same conditions apply. Looks like you can do SRM with Lefthand VSA as well, and you can at least do that with a 30-day trial. Has anybody set this up with a free or open source, albeit unsupported, tool? How about a set of virtual appliances?)
Completely new to SRM? Check out this new video (parts 2 and 3 coming soon).
[Update: from Chad Sakac in the comments, the Celerra simulator is available to everybody.]