Here are all of the Lemmings websites that I know of (besides cheat sites):

http://membres.lycos.fr/createmania/
http://www.garjen.co.uk/Lemmings.php
http://lemcrazy370.tripod.com/
http://www.geocities.com/TimesSquare/6150/
http://lemmings.freeprohost.com
http://utahdesign.com/lemmings
http://www.lemmingswelt.de/
http://www.martinzurlinden.de/lemmings/index1024.html
http://www.xeye.org/1995-2000/Lemmings.html
http://www.familylees.net/~morgan/
http://www.varley9.freeserve.co.uk/lemmings/
http://www.deveria.com/alexis/lemmings/
http://lemmings.deinonych.com/
http://www.kallex.de/lemmings/
http://home.wanadoo.nl/lemmings-solution/
http://lemnet.tripod.com/english-chronicles/index-2.html

Anybody know of any others?

Interesting! :)

For more, you can always search on Google

Well, I've searched Google a fair amount for them. And so many of the results are s*upid (censored for Icey's sake  :D) cheat sites!

You can also look at the links on each website. And for each new website that you could find, see the links on these pages. And so on...