Web Demo: https://dl.dropbox.com/u/5731948/JustLanded/index.html
Video Example: http://youtu.be/0Zc2Ffkw6Eo
Conditions tested on:
Windows 7 Ultimate (latest)
My game has a triple jump and a "ground pound" with the following controls:
A = Left, D = Right, S = Ground pound, Space = Jump (up to 3x)
On occasions where the platform is just in-reach for a triple jump, you can try a triple jump and then ground pound to land on the platform. If you do the pound low enough to the platform it doesn't reset the jump counter. The short video I made shows off better than I can explain.