I also still have my first customer for 3 years now(i change my company's name, my website's style, my domain name and he's still here) and the last year he's free of any charge :) (just for luck)
Our first client is still with us and numerous others who have been with us since the beginning. These are business websites for example painting companies and such they seem to stick around.
www.colorteck.com
"Fast affordable hosting with all the extra's"
I know I don't have my first client-- but I'm pretty sure it wasn't because of my service, I think it was because of money issues (that the client had).