I used to be a dock-to-the-right guy because obviously most screens are wider than they are tall, so it seemed that using up that space is less 'expensive' than using up space at the bottom of the screen.

Or is it...

All applications are designed (when necessary) to scroll their content from top to bottom, but will often truncate the right edge when content doesn't have enough space left-to-right. Sure, you can scroll in that direction too, but most scroll wheels don't do that automatically, and it would be overly cumbersome to do that for EVERY line of text you want to read. I realized that the more space I had left-to-right, the easier it really was to work.

So, now I'm back to be a dock-to-the-bottom guy.

Same here, plus you can always hide it if real-estate is a huge issue.

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Jayson --When Microsoft asks you, "Where do you want to go today?" tell them "Apple."