Thought I'd give a quick note on the different options that you have in a View pool, and a breakdown to what they do:
Reset the VM that you are on.
Allows you to change the snapshot either within the same base VM or select another base VM and snapshot. This new replica image will be pushed out to all the linked clones in the pool.
Rebalances all the linked clones to use the available space on the LUNs efficiently
Take the linked clone back to the same image as the original image. If there is a persistent data disk, that will be kept, but everything on the "C:" disk will go back to where it was.
Here's some books that should help out:
Mastering VMware vSphere 4 (Computer/Tech)
VMware Cookbook: A Real-World Guide to Effective VMware Use