Aerogel patenting is holding steady.  For example, since 2004, 78-110 US patent publications consistently emerge each year which cite "aerogel" in the claims or abstract.  2011 is holding steady with a projected number at 94.  Aerogels are a unique nanomaterial, known for their lightweight and insulation propertiesSome of their history can be found on the web.  Important markets can be found in the cleantech space.  Surprisingly, only 29 of all of the aerogel patent publications were deemed to fall within the 977 nanotech classification.

Aspen Aerogel recently filed for an IPO.  In addition, Cabot continues to sell aerogel materials