I presume you are speaking of an uchideshi program? Jun was good enough to setup a page
here where one can find links to many uchi deshi programs. I have recently started a 6 month uchi deshi stay at the Chudokan Dojo (Yoshinkan style), listed under the page I linked to. It has been very rewarding (and continues to be) and I recomend it to anyone.
Cheers,