I don't think LinkedIn endorsements really mean anything - just whether LinkedIn users click buttons to make annoying sections of screen go away :)
Nonetheless, it's amusing to see what people think one is good at. Here's me, today:
It will be interesting to see if this profile evolves over time (assuming LinkedIn keep the feature), and especially if it tracks as I do different things, or whether the existing biases in the endorsements will merely become more strongly emphasised (if the prompts to endorse me are based on existing endorsements). Hmm.