Just found this and thought it may be worth a look:
http://www.smart-page.net/smartnormal/fl10.htm
From the site:
"Smart Normal is a Flash 10 / AIR-driven, lightweight normalmapper supporting condensed and sobel-filters."
features:
* fast and userfriendly installation thanks to adobe air
* supports drag and drop (AIR-version)
* realtime filter preview
* can invert the source image and channels
* sobel-edge, condensed and blur filter
* supports jpg, png, gif-files
* saves uncompressed jpeg-files
* is only 130kb small
* is free to use
Intel Core 2 CPU, T7200 @ 2.00GHz, .98 GB of RAM, RADEON X1600, running Windows XP on Mac Bootcamp