How about some specs?
The main differences between the XL, XE and Original (O) are as follows:
Form Factor
XL: taller, wider & thinner.
Screen size
XL: 4.7"
XE & O: 4.3"
Resolution
XL: 480x800
XE & O: 540x960
Storage
XL: 16GB onboard - no microSD
XE: 4GB onboard & microSD
O: 1GB & microSD
Processor
XL: Single core 1.5GHz
XE: Dual core 1.5GHz
O: Dual Core 1.2GHz