This is a little more fair Comparison:
eSATA: AVG Read: 77.9 MB/s, Burst 128.8 MB/s
FW800: AVG Read: 78 MB/s, Burst: 88.9
looks like for the AVG Read, the drive itself (Raptor X) is the bottleneck, not the interface
for burst speed, the eSATA flexes its muscles a bit, where as FW800...