I posted this plus some slightly different comments on another site I was on. I'd totally forgotten about it. At the time (around 8 mos ago) Turbo Mag had just put out a great article on how to read compressor maps and pick the right turbo. Hopefully these links will come in handy for those of you looking to go the forced induction route.

The article from Turbo Magazine isn't on the web (yet, if at all), but I found plenty of outside sources that are comparable as far as ease of understanding. If the one I read is ever posted to the web I'll link it. The diagrams were better illustrated.

Here's a few:

http://cherrypicker.tripod.com/turbo...0dett/id6.html

(This one's really thorough)
http://www.gnttype.org/techarea/turbo/turboflow.html