The best free stock-screener is considered to be the MSN deluxe screener.
http://moneycentral.msn.com/investor/controls/finderpro.asp
I've never used it, but I've heard it is by far the most powerful.
If you're interested in growth, you can do combinations like a
certain percentage YOY growth combined with a projected 5-year growth,
combined with a certain ROE, combined with a certain PEG. etc.
etc. Basically, whatever you want.
I've come across simpler
ones that included PEG, but I haven't bookmarked them. But if you
google on "stock-screener", you'll likely come up with several you can
try.