G5: Side-curtain airbags, XM satellite radio and a tire pressure monitoring system are standard on all models, while the GT gains StabiliTrak electronic stability control and OnStar.
G6: The GTP model is replaced by the GXP, which adds sportier body trim, hood scoops, bigger wheels, and a leather interior. The GXP uses the same 3.6 liter V6 introduced in last year's G6 GTP, but with a suspension tuned for more aggressive handling. Elsewhere in the G6 universe, front-seat-mounted side airbags, antilock brakes, OnStar and an audio input jack are now standard on all models, while the GT gets XM satellite radio.
G8: Like the now-defunct GTO, the G8 is based on one of GM's Australian cars, in this case the Holden Commodore. The rear-wheel-drive G8 will be available with a choice of 3.6 liter V6 or 362 horsepower 6.0 liter V8 powerplants.
GRAND PRIX: Rumors of the Grand Prix's demise have been greatly exaggerated. Though the front-drive Grand Prix was expected to be replaced by the rear-drive G8, the two will share the showroom for the time being. The GT model is gone, leaving just the V6-powered base model and the V8-powered GXP.
SOLSTICE: OnStar, XM satellite radio, CD/MP3 stereo with speed-compensating volume, and a tire pressure monitoring system are all standard; StabiliTrack electronic stability control is now optional on the base model. Two new colors are offered: "Sly" (gray) and "Brazen" (orange).
TORRENT: A new GXP model comes with a 3.6 liter V6 engine, 6-speed automatic and sport-tuned suspension. The StabiliTrak electronic stability control system is now programmed to detect and attempt to correct trailer-sway problems.
VIBE: After being trimmed to a single model last year, the Vibe returns for 2008 with no major changes. A new version of the Vibe debuts in early 2008 as a 2009 model.