I remeber Seabreeze for Seaside had some interface to webcam (using flash) and by using a webservice to decode barcodes.
You can see it in action in the second video at the bottom of http://seabreeze.heeg.de/ A short description is here http://seabreeze.heeg.de/files/SBWebsiteFiles/seaBreeze.pdf Maybe the barcode widget is available in the MIT licensed open source distro (based on VisualWorks) Hope that helps! Bye T.
