It's odd to do because you have to consciously think about it. But eventually it does become second nature. I find I can now alternate between heel striking and forefoot striking as required, to give my calves a break.
I've found that forefoot striking encourages a more efficient running motion and therefore is speedier. When I switch back to heel striking I feel "clumpier" although it is more relaxing. I reckon my times have improved using the technique, probably taking off 15 secs per km over 10k compared to a few months ago.
As an aside, does anyone else find that their big toe wears a hole in the top of their trainers?! I've had 3 pairs of Asics and each pair has the same hole where my big toes have rubbed right through the material on the top. They do fit me perfectly though. Weird.
Finally, I've been learning piano for about 6 months and I can now play stuff that doesn't sound like a retarded gorilla. I've spent a few weeks trying to learn Mozart's Minuet in F which Wolfie wrote when he was 6. And here's anothere 6 year old playing it on Youtube. Gah!
Here's a gratuitous pic of my piano (it's a digital one). It's even got dinky pedals so I can pretend I'm a real Liberace.