> and how come the dlink is 5 times the price of the linksys?
Because the D-Link has a larger CCD, is color and works in 100 times less light (0.5lux compared to the 5.1lux for the Linksys).
http://www.dlink.com/products/resource.asp?pid=365 is more comparable model to the Linksys, except that one still works in lower light than the Linksys.
I would probably go with
http://www.dlink.com/products/?pid=546 because that one has PTZ and can also be checked from 3G enabled cell phones.