If you would like to find out more about springtail, check it out here on Wikipedia.
I've shot springtail before but only when they came into the frame when i was shooting something else, like when shooting an ant. :D
This one was 2mm long excluding the antennae. To be honest, I lost it when attempting the high mag shots. I had to zoom out to 1:1 again on my MP-E65 to re-position my lens and zoom in again slowly from there.

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this is how it looked like at 1:1 :D. I wouldn't have seen it if it wasn't moving at that time. But it did settle down for me to shoot.

It's been IDed as Collembola: Paronellinae by Frans.
Watch a short clip from Life in the Undergrowth
All images were shot with a Canon 40D, Canon MPE65 1X-5X Macro Lens