Don't know if this has been put up before, but it is a list of all the White Labs and Wyeast strains matched up. No more confusion over if Wyeast 3787 is White Labs 500 or 550. Plus at the end, there is list of origins of each strain from both companies
http://kotmf.com/articles/yeastcomp.php
http://kotmf.com/articles/yeastcomp.php