UPDATE

In light of new information, I'm updating this answer. The 2010 MB Air uses "pentalobe" screws, as described http://www.ifixit.com/blog/blog/2011/01/..., and as rab777hp says below.

We have both an http://www.ifixit.com/iPhone-Parts/iPhon... to get past the new pentalobe screws, as well as a http://www.ifixit.com/Tools/MacBook-Air-....

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office, the bit you are referring to is not the same as the "star" shape screwdriver in our 54 Piece Bit Driver kit.

To clarify the other answers here, vendors for the 5 point security Torx bit are required to do have customers do the following: "In order to purchase these bits you will need to sign a letter stating that you are an authorized serviceperson for the equipment where TORX Plus® tamper-resistant screws are used."

Sources: http://forum.miata.net/vb/showthread.php...

http://forums.macrumors.com/archive/inde...

iFixit 5-point MacBook Air Screwdriver:

http://www.ifixit.com/Tools/MacBook-Air-...

iFixit also carries the MacBook Pro 5-point battery driver:

http://www.ifixit.com/Tools/Torx-Plus-5-...

iFixit is also actively working on a solution to fit the new iPhone 4 5-point screws. If all goes as planned it should be stocked within the next week here:

http://www.ifixit.com/Tools/iPhone-4-5-P...

These screws are pentalobe screws, to open it and to put in standard phillips ones, get iFixit's iPhone 4 Liberation Kit.

You can get a whole set of perfectly legal 5-POINT STAR TORX TAMPER PROOF SECURITY BITs right here: http://www.amazon.com/Anytime-5-POINT-TA...