Look for this little BIG disk in early July. Lightweight, portable, built-in RAID 0, and four interfaces. This may be the portable disk I've been looking for. Although I'm not too sure about the design. It looks more like a stationary disk and not something I'd want to shove into my gear bag. And even though I know the RAID 0 will give great performance, I just might have to have two of these, one for backup. It does have some very nice high-performance features:

Capacity : 1 TB
Interface : 1 x eSATA 3Gbits port; 2 x FireWire 800 ports (FireWire 400 compatible); 1 x Hi-Speed USB 2.0 port
Cooling System : Aluminum heat sink design for safe, fanless, quieter operation
rotational Speed (rpm) : 5400
Cache : 16MB (2x8MB) or greater

Interface Transfer Rate (max. bus speed) :
eSATA 3Gbits: up to 3Gbits/s (300MB/s)
FireWire 800: up to 800Mbits/s (100MB/s)
FireWire 400: up to 400Mbits/s (50MB/s)
Hi-Speed USB 2.0: up to 480Mbits/s (60MB/s)

Burst Transfer Rate1 (max. drive speed) :
eSATA 3Gbits: up to 105-115MB/s
FireWire 800: up to 75-85MB/s
FireWire 400: up to 35-40MB/s
Hi-Speed USB 2.0: up to 30-35MB/s

See more at: LaCie Little Big Disk Quadra