Questions on LS1 Edit...
www.HPTuners.com Hptuners scanning/tuning package
www.efilive.com/ EFI Live scanning/tuning package
www.carputing.com/ LS1 Edit tuning package
Those are three of the most popular tuning software/hardware packages for the LS1/6. The first two, HP Tuners and EFI Live, include two main functions. The first is a data scanning/logging tool by which you can collect data from the car as you drive and save this data onto a control module or directly into your laptop. The second function is a tuning program that you use the logged data to tune your PCM for optimum perfomance.
The third package, LS1 Edit, has been only a tuning tool to date but they are supposed to be releasing a new version with an integrated scanner soon.
Also, The first two include integrated wideband oxygen capability so you can use a WB sensor to collect A/F ratio data and incorporate that into the tuning. Here's a web page on my WB install for EFI Live.
Wideband O2 install










