The new Air has a mini Sata connector as the drive is 1.8. The connector looks the same as the 2.5 inch ones but is smaller. You can get adapters on Ebay that are like enclosures that convert the 1.8 sata drives to 2.5 inch drives that will work in the Macbooks and Macbook pros. I have one of these that was used in a Levono. It's a Samsung SLC 64GB SATA2 SSD 1.8 inch that will work both in the Macbook Air and the Macbook using this adapter.
Note: since these are just chips It may be that a lot of these new SSD drives are just 1.8 drives with adapters. That way they have just one model to manufacture; at least that makes sense.
I'm testing an Intel X-25 and I suspect that it's just an X-18 (1.8") with an larger mounting bracket around it. (I'm not going to take the bracket off to see cuz if i'm wrong (which I usually am) ....well it ain't cheap folks
BTW here's the xBench for a Macbook unibody 2.0GHZ, X-25
Results 238.16
System Info
Xbench Version 1.3
System Version 10.5.5 (9F2088)
Physical RAM 2048 MB
Model MacBook5,1
Drive Type INTEL SSDSA2MH080G1GC
Disk Test 238.16
Sequential 159.85
Uncached Write 133.02 81.67 MB/sec [4K blocks]
Uncached Write 119.05 67.36 MB/sec [256K blocks]
Uncached Read 156.46 45.79 MB/sec [4K blocks]
Uncached Read 368.47 185.19 MB/sec [256K blocks]
Random 466.85
Uncached Write 630.76 66.77 MB/sec [4K blocks]
Uncached Write 188.52 60.35 MB/sec [256K blocks]
Uncached Read 1575.47 11.16 MB/sec [4K blocks]
Uncached Read 958.38 177.83 MB/sec [256K blocks]
I'd say 'Smokin' but apparently it runs rather cool
