calling all group meetings

Hi internet!

I have a favour to ask of ye: our group has recently become rather... largeish. I'd guess we total about 12-16 people including students, postdocs, undergrads, etc. I'm looking to find ways to improve our weekly group meetings, so they stay well away from the "herding cats" side of the group meeting spectrum and focus on the "informative and efficient" side.

So! In order to facilitate this, I was hoping I could solicit the input of the mighty internet. What has worked for you in group meetings? What drives you nuts? If you could change any one thing about group meeting, what would it be?

As an enticement to get those creative juices flowing, anyone who emails or comments me their input will get a postcard featuring the beautiful and mountainous mountains of Alberta! I might post the responses (assuming I get any) with your permission, anonymously if desired. My email address is joel dot kelly at ualberta dot ca.

(I would have offered free Canadian donuts or beer, but I have my doubts about shipping those without getting stale.)