Have you checked out LensHero yet? If not you should. I ran across it by accident killing time the other afternoon and was pretty impressed. It's a fairly straight forward system to help you choose a lens (or several) that fit your budget and your camera system. You can filter them by style of lens (macro/zoom/etc) or have the system suggest something for you. The results are nicely done and include photos of the lenses, your typical specs (aperature/stops), and weight/size information. The page for an individual lens has linked reviews and more technical information. The only thing they don't seem to offer is telling them what you have and suggesting lenses that would fill in the holes in your system, or a space to share photographs taken with a particular lens to get an idea of what's possible. Overall? I think my wallet may get a little lighter now that I've discovered more lenses than I knew existed for my camera. LensHero has the foundations of what looks like it's going to be a great site. They're also giving away some nice lenses and toys to kick off the launch of the site- but be quick. The contest ends on the 23rd though, so be quick.