Originally posted over at Seetrail; backdated here.
I watched this spider make an attempt at a wasp that walked over the hole (repeatedly), but there wasn't much else to report on that - the wasp got away. But the spider had grabbed the caterpillar not 5 minutes sooner, so it's just as well.
(I would post video of the above incident, but in the background you'd hear me rambling on the phone about the camera... and nobody needs to hear that!)
At some point I may try to get photos of a lovely ichneumon wasp on here... yes, it was in the process of dragging away a caterpillar (and down into the hole they went).