Of course you could always ask for volunteers to assist you with your project. I'm sure you could find a few helpful types willing to assist you with your heavy burden.
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I used to be somebody but now I am somebody else
Who I'll be tomorrow is anybody's guess
You know, I had a similiarly sleazy response as DEG and Geo all typed up before there were any responses in this thread , but I said to myself: Nope; I'm not gonna do it. I knew it would happen, though.
I use Directory Opus ( here ) in place of Windows Explorer. It has a batch conversion option for images, allowing you to set filetype and size. Works quite well.