Memory: PSP - 32MB - 4MB DRAM (plus memory stick) DS - 4MB iPhone - 128MB (this isn't published by Apple, so this was a calculation from a developer I found)
Media: PSP - UMD - 1.8GB capacity DS - Cartridge 1 gigabit (Note: 8 gigabits = 1 gigabyte, so PSP UMD discs hold about 14 x as much as the DS cartdridge) iPhone - 8GB or 16GB
Wireless: PSP - IEEE 802.11b (Wi-Fi) up to 11Mbps - 16 players DS - IEEE 802.11 (Wi-Fi) up to 2Mbps - 16 players iPhone - IEEE 802.11b/g (Wi-Fi) up to 54Mbps
Battery Life: PSP - 2.5 hours watching UMD movies - 3-6 hours playing games (depending on brightness and multiplayer function) DS - 6-10 hours playing games iPhone - 7 hours of video, who knows what games would take.
Features: PSP - USB 2.0 port - Analog stick - JPG pics - MP3 music - MPEG4 video DS - Touchscreen - Compatible with Game Boy Advance - Built in microphone iPhone - it's a friggin iPhone!
Well, the iPhone seems to me to be better in almost every respect. This just might be the best portable gaming system to ever hit the market!
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