Here's something I did a couple weeks ago when I heard the news about the GTO possibly coming back in 09. I personally think the GTO will be more successful than reintroducing the Firebird.
I strongly disagree with GM's usual cost-cutting practice of simply rebadging a Camaro and adding some minor styling adjustments to get a Firebird (or vise-versa). By increasing the rear overhang and raising the roofline slightly of the Camaro, you now have a more practically sized, high-performance passenger car, a true "musclecar". It will have room for 5 (4 large adults) and a real, usable trunk. Marketing can hit 2 price points with related but different cars.
The biggest challenge, as mentioned in every Camaro discussion, is pricing it so the average young guy can actually afford it.
Let me know what you think! Enjoy!