Hi David,
There are a couple of stroker cranks out there for the LS1. COLA and Lunati both make cranks. Many of the rod manufacturers are making rods for them and there are plenty of forged pistons too.
Check out this link for some examples of the stuff that's available.
http://www.ls1f-body.racenet.net/engine.php
BTW I'm finally picking up my engine this week end. I went for a brand new Camaro/Firbird LS1 Crate motor. This one has the sump reservior at the rear which means it shouldn't have the oiling problems the Holden motors have been experiencing. They were also kind enough to supply the Corvette aluminium mounts that my chassis is set up for. I'll post some pics when I get it home.
Cheers