I've been to my local surestart centre a few times and they often have a snack table.
Sometimes there's a formal snack time and other times the table is just left ouf for children to help themselves.
They often serve whole grapes as a snack - I know they maybe don't have time to cut the grapes up but I have a friend who is a paediatric nurse and has seen more than one fatality in children who have choked on grapes 
I'm probably going to be told IABU because it's the parents responsibility to cut them up. I do bite them half for my 15 month old, but today as I was sitting with her distracted talking to someone the surestart lady held out the bowl of grapes to her and she took one and started eating it and I had to fish it out of her mouth.
Lots of the parents don't sit up with the children at snack time and I guess I just think it's a bit dangerous if one of the little ones chokes on one. I just wonder why they don't serve something else instead if they aren't going to cut up the grapes.