– Nintendo licensed WPA code
– new AC adapter
– 802.11b and 802.11g support only
– codename of DSi could have been ‘Twilight’ based on the model number ‘TWL-001′
– Unit weight: 214g
– Unit size: 74.9mm x 137mm x 18.9mm (how does this compare to the DS Lite)?
– Battery life (brightest to least bright): 3-4, 4-6, 6-9, 8-12, 9-14.
– screen resolution
(256×192), with 3.25 screens

Link