I found this recent post by Eddie Mosely to be very timely for many of our groups right now.
If not ALL of your group invitees showed up to the first meeting, please read this and consider his pointers on connecting with them: http://eddiemosley.wordpress.com/2011/08/24/only-half-my-group-showed-up/
Thank you, leaders!
In ministry together,
UPDATE, JULY, 2012: If you have stumbled upon this post because the title looked interesting, I want to equip you with THE BEST ice breaker to have in your arsenal for the week when only half of your group shows up. See the idea, from a post in July, 2012, here: http://lakecitysmallgroups.com/2012/07/19/best-small-group-ice-breaker-ever/