I meant to comment earlier on what a nice group shot this is. Compliments on the lighting balance too. Thanks Shirley for reminding me.

There's been a study of how many pictures you need to take of a group to obtain a blink-free picture in a given time frame: 1/(1 - xt)n (n is a power in this formula) - it won an ignobel prize: http://web.archive.org/web/20110219234209/http ://velocity.ansto.gov.au/velocity/ans0011/article_06.asp :)