The following sites, all related to photography or imaging, are very interesting:
Belgiumdigital: an elaborate site with tips and tricks about digital photography and image processing. It includes a very active dutch forum.
DPReview: english website with a lot of information about digital cameras. Several reviews and forums are available for all the well-known brands and models.
Photo.net: a versatile website that covers all the aspects that are related to photography.
BVNF: a belgian association that encourages nature photography in a respectful and responsible way.
Luminous Landscape: a nice site with detailed information regarding photography. Emphasis on outdoor photography: landscapes, nature en documentaries.
Nature photography index: a page with a collection of links to web sites of both professional and amateur nature photographers.
Canon camera museum: You can find here a detailed overview of all the Canon lenses and cameras that were ever made.
Edwin Giesbers: gorgeous nature photos from this award-winning dutch photographer.
Bart Heirweg: Bart Heirweg, an amateur nature and wildlife photographer, exhibits his stunning photo collection on this web site.
Online Nature: Web site with various kinds of photos made by Lieven Decrick and Sander Van Haver.
Focus on wildlife: the personal web site of Frank Snijkers, a belgian amateur photographer. By category, he has ordered alphabetically a nice collection of animal photos.