I quite like the concept but the three elements (heart, mountain and plane) feel like they were never intended to be put together like this, the styles are all quite different (almost clip art ish). The strongest part is the shape of that heart.
Also I'm sick of seeing everyone complaining about the designs being off center and saying "PUT IT IN THE MIDDLE HURR HURR" Designs that are off center are little bit more interesting.
About my design
There's some quality loss when you zoom in, so here's a big .jpg version: http://foxwell.dk/threadless/groundspeed.jpg