All I can say about this one is that it is a Jumping Spider of the family Salticidae, and that it certainly lives up to it's reputation. With a total body length of only around 5mm-6mm it managed an amazing jump of about 40mm - 50mm in an effort to escape my camera. It succeeded too. It landed down a deep crevice in a tree stump where I could no longer see it.
In the absence of a more precise name I've decided to call him Groucho. If you can't see any resemblance then you may need to compare photos #3, #4 and #5 :-)
Edit: I've since found that this is Opisthoncus polyphemus
(Click Photos to Enlarge)