not sure if this has been mentioned here yet,
yopy PDA... http://www.yopy.org/
specs
PDA running Linux 2.2.13. Here's the hardware feature list:
3.9" 240x320 backlit TFT LCD (64K color)
StrongARM SA1110 @200MHz
FM Radio receiver, Audio record/playback
3D Sound Stereo Audio CODEC
RS232C & USB port
CompactFlash Type II Slot
IrDA Standard included
Audio In/Out Jack
Front-view Speaker
1400mA Rechargeable Li-lon Battery
Size(H x W x D): 5 x 3.25 x 3/4 inches
Weight: 8 oz.
Optional digital camera
And the software feature list:
MP3 player
Graphical game (not sure what game)
Calculator
Note pad
World clock with alarm
Handwriting recognition
don;t know about you lot, but this looks like an pretty good starting
point for a cheap comercially available wearable ;)..
a hmd might be a little tricky to interface though !!
Regards
Neill
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Neill Newman Tel: Mobile 07970 673722
Department of Electronics Systems Engineering Work 01206 873708
University of Essex Fax: Work 01206 872900
http://wearables.essex.ac.uk/index.html email: 
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