It looks like we're finally going to have a use for slime balls. Jens has tweetedthat we'll be able to use slime balls to make the new Pistons in 1.7 into Sticky Pistons, what that means exactly, we haven't figured out yet.
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usually it meansWhen E.G. a Sheep is besides the piston and the sticky piston will be activated the sheep will sticked on the piston and can´t move
Well, actually, there are sticky pistons in the piston mod (I haven't used the mod, but have seen them in several youtube videos). Normal pistons simply shift a block so that when the piston retracts the block doesn't return to its initial location. Sticky pistons, however, "pull" the block back to its initial location when they retract. I'm assuming (and I think it's a pretty safe assumption) that this is what is meant by "sticky pistons".
maby with the sticky ones if it hits a floating item(a droped tool or something) or sand/gravel it pulls it towards the piston. thai would be good on custom escape maps as you could have to do something to send poower through redstone and activate the sticky piston that pulls a bit of sand onto a presure plate that opens the door.