Cabot produces windows, ceilings, and skyights using an aerogel product they call Nanogel sandwiched between glass. The result is diffused natural light with much greater insulation and energy savings.
The Laken ISO 70 Aerogel-Insulated Water Bottle keeps your water cold and adds much less weight to your backpack.
You can try out aerogel's insulating properties without spending a lot of money by trying out some shoe insoles from PolarWrap.
United Nuclear sells aerogel in granular form and solid blocks for those who want to experiment (meaning: play) with it.
And if you just like the way it looks, you can get aerogel jewelry from AeroGem.