While cleaning up our lot the other day (think: sweat, machete, sore arms....) Steve had the distinct displeasure of discovering that we've got a pretty big wasp nest in the corner. Ouch. After getting 6-10 little "reminders" around his hairline, he backed off (think: flailing madly while running blindly and thrashing himself about the head) and decided to leave that corner of the lot for another day.
This page has some interesting photos of wasps and wasp research. The ones that we've got (based on Steve's pain-filtered recollection of the nest) looked like these. The way that they stream out of the nest opening and start crawling all over the nest is pretty to watch. Also a good "hey, time to get out of here!" indicator.

Wasps are important pollinators and help keep many plant pest populations under control (they eat all sorts of plant parasites). Here are some more wasp facts and stories.
Still don't want them on the lot.

As a side: if you think natural history and insects are interesting (we do) take a look at this story about Thornbugs.