Both taken on Sunday (2 days ago) with my Vivitar Series 1 28-105 f/2.8-3.8 Macro zoom, on my K10D. I think I had it at 1:2 (maximum magnification, 28mm) for the caterpillar; can't remember for the spider.
I just clicked "buy" on a S1 70-210 macro zoom on the bay. I'm going to Tasmania in a couple of months, and I plan to spend as much time as I can walking around with my Vivitars - with the arrival of my newest purchase (LBA is a harsh addiction) that set will be the 28-105, the 70-210, and a 105 macro. I've seen a few photos around here with that 105 in the botanical garden in Hobart, that's definately on my list of places for a photowalk.