What insect repellent do you find the most effective?

As some of you know, I have been fighting WW 3 with no see’ums for three years. I finally had the house treated yesterday so we’ll see if that does anything. In the meantime, I’m curious to hear which repellent you find the most effective and the least, er, repellent. Talking about no see’ums but also mosquitos and other biters.

Again, in General, please stick to the topic.