Hi Yuwei,
Thanks for the link. I guess that is more of an urban oriented site than we are looking for - but it could also be useful.
I'm sure Anna will explain the Amble Jam concept (it is still evolving :-)
BTW, it seems there are walks sites that rely on OSM data - examples being: http://hiking.waymarkedtrails.org/en/?zoom=11&lat=53.46135&lon=-1.91...
http://www.gpsies.com/#12_53.426923691696736_-1.88690185546875_mapQuest
However, I know we have to be careful over what we place directly on OSM - as, like wikipedia, other users might remove the data if it doesn't comply with either the "rules" or the general spirit of the site.
As I missed the last meeting and haven't been following the mailing list posts closely enough lately, I'm not sure what project you have in mind here. But, if you are interested in uploading multi-media assets to a digital map, you can also have a look at Maxamundo which is also based on OSM data -
http://www.maxamundo.com/cms/index.php
Hope you are all well.
Best wishes, Yuwei