Hi, sorry for the advertising here..
But check this out.
www.BikeMap.net uses openstreetmap as one of the maps available to choose from.
YouTube video (in German) http://www.youtube.com/watch?v=LpWctNV4yXs

It uses elements from all the other GPS collecting sites that i found before, and incorporates most of the thinks which are the best from each.

I am sharing this.. because this is EXACTLY what im looking for, and can see how users can now... (as soon as they want to) see where openstreetmap needs improvement, and post their GPX tracks here and fix it. ... but using this awesome routing site to share it.
That's soo cool.

Once i get into it a little, i probably have a few sugestions. But on 1st glance... WOW... it's awsome :)

(we can give ourselves a pat on the back, as together we can make OSM the most widely used map... and the most useful map, better than all other maps :)

Go OpenStreetMap :)

Cheers,
Sam