class dennis_ritchie {
  public:
    dennis_ritchie() { create_c_language(); create_unix(); }
   ~dennis_ritchie() { rest_in_peace(); }
};

• "Thunderbolt" connector. This is the copper version of Intel's "Light Peak" technology; it's a single 10GB connection that will eventually replace USB, FireWire, SATA, and HDMI. The connector is physically identical to Apple's Mini-DisplayPort connector (and it's backward compatible), so you can already use it to connect displays.
• High definition FaceTime camera (webcam). I'm not sure what that will do to upstream bandwidth requirements; I expect most users won't be able to take advantage of the full resolution.

• Prices unchanged at $1199/$1499
• CPU changed from 2.40/2.66 GHz dual-core Core2 Duo to a 2.3 GHz dual-core Core i5 or 2.7GHz dual-core Corei7. That's a fairly significant improvement.
• Standard RAM is unchanged at 4GB on all models.
• Standard hard drive lineup up from 250/320 GB to 320/500 GB.
• GPU is now the Intel HD Graphics 3000 instead of the NVidia GeForce 320M; this is a wash at best, perhaps even a slight downgrade
• Battery life down from 10 hours to 7 hours

• Prices unchanged at the low and high end at $1799/$2199 (no more $1999 model)
• CPU options now 2.0/2.2 GHz quad-core Core i7, instead of 2.4/2.53 GHz dual-core Core i5 or 2.66GHz dual-core Core i7
• Standard hard drive lineup up from 250/500 GB to 500/750 GB
• GPU is now Intel HD Graphics 3000 + AMD Radeon HD 6490M, instead of Intel HD + NVidia GeForce GT 330M; pretty much a wash
• Battery life down from 8-9 hours to 7 hours

• Prices up from $2299 to $2499
• CPU options now 2.2/2.3GHz quad-core Core i7, instead of 2.53/2.66 GHz dual-core Core i7
• Standard hard drive up from 500 GB to 750 GB
• GPU is now Intel HD Graphics 3000 + AMD Radeon HD 6750M, instead of Intel HD + NVidia GeForce GT 330M; this is an improvement
• Battery life down from 8-9 hours to 7 hours