I'm having trouble finding the item online for quick reference, but I  recently found at Sears a set of 2 craftsman LED cliplights which could very easily be converted to IR by swapping out the bulb, $20.00

It can be clipped onto eyeglasses, a hat, or headphones, etc.

I'm not sure if the item has been discontinued or not, but either for a night reading light (on the plane, etc), camping, work, or use for head tracking, it's a great item.  It also has magnets for attachment to tools, etc. 

extremely useful, I thought I should post it here.

This is an alternative version, though I can't confirm its usefulness:
http://auto.sears.com/RAMPAGE-CLIP-ON-MAGNET-LED-INTERIOR-LIGHT/Product.htm?catalogId=10625&N=600026173&productId=2017930

the one I found is item #3493340
description: 2 Ultra Bright magnetic clip-on LEDs with a zipper case included