DesertJester:
If you get the Sentia, It is a ULTRA PORTABLE machine of AW
12.1" Display and Light-weight
A Range of 1.5-2.0 Ghz Pentium M (1.5+1.6 Ghz have 1MB L2 Cache)(1.7ghz+ have 2MB L2 Cache) and Can Acheive 2GB RAM

Unfortunately just has Intel Extreme Graphics only

Harness High Battery life
If you get the Area-51m is the TRUE POWERHOUSE of mobiles from AW
15.4" SXGA Display
2.8 - 3.4Ghz P4 and Option of P4 Extreme

and acheive 2GB RAM
Choice of Graphics Card (Radeon 9700, Fx5700 or "Quadro 1000 in Mobile Workstation")
Battery level lower than Sentia (Obviously, its a P4 POWERHOUSE

)
Either one can support a Large HDD and both have same Software/Perheprial options
If choosing between the "Ultra-Mobile" or "Ultra-Powerful" of AW, It's either way a good choice

.