Quite a few websites have popped up in the last few years that allow you to have contact lists. Most of those sites are of a rather personal nature, ie you’re supposed to save your personal contacts there.
But recently there has been a sense of professionalism in this area as well and you can now use some sites to do actual networking, find (or refind) former colleagues or other professionals that share your interests. I find this trend to be very positive. One example for such a site would be http://www.openbc.com
I’d like you all to share other professional networking sites you know of.