So you want to know how the pros test all those HDTVs.

ENGADGET: So you want to test HDTVs, eh? HD

That cyclists are leading the push to test amateurs is likely no coincidence, considering the large number of pros in that sport who have cheated, most notably Lance Armstrong, who late last year was stripped of his seven Tour de France titles and who has since acknowledged doping during his cycling career.

WSJ: Cycling's Minor Leagues of Doping

In terms of changes, besides the new, high-test plastic casing (built in the same fashion as the aluminum MacBook Pros) the 13-incher boasts a LED-backlit display, new glass multitouch trackpad, and a built-in, "7 hour" battery.

ENGADGET: MacBook goes unibody, available today