[r3012]

There are trade-off there to consider.

One get's ruggedness but carbon fiber is generally not a good thermal conductor which could be a problem for a laptop with no fans. And titanium is very expensive compared to aluminum.

Like all engineering. It's about priorities.

[zik]

He said magnesium, not titanium.

[invalidname]

I guess he was referring to the old titanium macbook pro (during the G4 era) which was amazing. I had one in my motorcycle sidebags and it survived amazing abuse.