Incite http://www.spie.org/incite/
SPIE (the International Society for Optical Engineering), an electronic search service and online purchasing center, contains more than 90,000 SPIE papers and abstracts.
International Commission for Optics http://www.ico-optics.org/
Contributes on an international basis to the progress and diffusion of knowledge in optics. Gives details on conferences, meetings, awards, travelling lecture programs and ICO newsletters.
Photonics Online http://www.photonicsonline.com/
Daily news and product updates for professionals in the optoelectronics industry: manufacturing, technology, equipment, supplies, discussion forums, chat, newsletter and software.