http://www.gamedaily.com/articles/news/wii-thirdparty-struggles-highlighted-by-may-npd/?biz=1
"[UPDATE: Boom Blox sells just 60K.] With the exception of a very small few, third-party Wii games just can't succeed and continue to be overshadowed by Nintendo titles. And what the heck happened to Boom Blox?"
(more at the link)