A few months ago I read a post on this forum with a link to a great lens comparison website which allowed you to select the lenses you want to compare and have similar pictures taken with the lenses come up in a composite window. I have now lost the link and I cannot find it again. Does anyone know the site I'm talking about?

By the way, I currently have a canon 350d and only the kit lens but I'm thinking of upgrading the lens. Given my budget I'm considering the sigma 18-50 f2.8 or the sigma 18-200 with OS. My main use for my camera is to take pictures of the kids - mainly indoors and I'm not very happy with the sharpness of the pictures I'm getting from the kit lens. I would like the flexibility of the 18-200mm lens but I would also like to generally improve the sharpness of the images I get. Would the 18-200 give an improved sharpness compared to the kit lens?