So I'm just getting started, both with running and also with Nike+/Slowgeek. I think I'm a lot like Rasmus - I'm a geek looking to use technology to keep my interest in exercise 
I have an iPhone 3GS and a pair of Nike+ shoes with sensor. Runkeeper is an iPhone app that uses GPS to provide the same metrics as Nike+, but also is able to map your route and measure elevation changes. Another nice feature of Runkeeper is that you can program interval workouts to your liking (as well as other workout types) and receive voice feedback. I'd have to say Runkeeper is much better than Nike+. The only downside is that GPS relies on line of sight to the sky and so would be utterly useless indoors during wintertime and inclement weather.
So far I've run twice, once with Runkeeper and once using Nike+ and Runkeeper at the same time for comparison. Other than a minor hiccup with the Nike+ workout not starting correctly and missing the beginning of my run, they both performed well.
Because the two systems are separate, the data is separate. I'm not sure if Runkeeper has an API that they would allow to be 'abused' like Nike does, but I'd sure love to have a way to use one or the other method and have either one show up here on slowgeek.
Does anyone (RASMUS) have any experience or ideas with this?
You can see the data from my run this morning here:
Runkeeper: http://bit.ly/UkPuM
Nike: http://bit.ly/aCSyG
EDIT: When I say 'run' I actually mean walk 
