4/3rds System Website...
If you have a 4/3rds system camera (ie most new Olympus cameras and a few Panisonic/Lumix cameras) you will probably want to check out 4-3 system.com. Though it seems to just be starting out, it has an excellent view of all the available lenses for your 4/3rds camera.
And if you don't already have a DSLR and are at least somewhat interested in upgrading from your current point-and-shoot digital camera I would recommend visiting the site as well as taking a look at the Olympus Evolt E-500 camera (it's what I use) as from a users viewpoint (as well as many established camera review websites) it is THE best bang for the buck camera on the market. See a review here.