Looks like the field is expanding. Just saw this on PCMForless.com
[B][B]LS2 Tuning now available
[/B]We are pleased to announce LS2 tuning for 05 and 06 Corvettes, GTO's, Trailblazer SS, and SSR trucks. While cores are not available yet due to the short supply of these PCM's we do offer 1-2 day turnaround on your LS2 PCM. Dyno tuning is also available. For more info email Bryan at [COLOR=#0000ff][email protected][/COLOR]
So now there's VMS, HP Tuners, Westers, EFI Live, and PCM For Less. Should only help us as the knowledge improves.