High tech glasses

I recall reading about 'memory glasses' being developed at MIT several years ago. Memory glasses provide subliminal cues to serve as reminders to the wearer:
http://www.media.mit.edu/wearables/mithril/memory-glasses.html

I began thinking about how to integrate these with GPS and text message marketing, and also about how to combine an mp3 player for a cordless solution, and also to integrate with a PDA via USB or a memory chip to open up the display for browsing the web and for reading as an alternative to the kindle/ebook readers - I've seen such use for viewing movies from a PDA.

Probably would have to be specialized glasses specifically for sport that might include built-in earphones and mp3. Could also use eye tracking for military targeting, GPS for environmental feedback, retinal readings for biofeedback. Be nice to build in a camera as well.

Despite the annoying pop-ups that reappear on every page, here is an interesting review of 10 geeky glasses currently available or in the works, some of which include a few of the aforementioned features:
http://www.pcmag.com/article2/0,2817,2339521,00.asp

View the slideshow:
http://www.pcmag.com/slideshow/0,1206,l=236332&a=236330,00.asp