When I started openmtbmap.org my primary goal was to get more Mountainbikers to participate in Openstreetmap. From virtually zero MTB Routes and ways classified with mtb:scale, Openmtbmap.org has changed this tremendously. Currently around 2000 people ( ~15.000 Pageviews) visit openmtbmap.org each day. Every day up to 3000 maps are downloaded causing ~ 500GB of traffic.
There are many more blogs/press articles about openmtbmap.org – if you would like to see your post/article referenced here, drop a comment, this is just a selection (last full update June 2010)
Most Popular Forum Threads about Openmtbmap.org:
Online Journals / Newssites mentioning Openmtbmap.org
http://www.wired.com/gadgetlab/2009/08/gps-hackers/ – This article appared on the frontpage of Wired.com, and nearly brought my server down (over 25.000 visits during 24hrs, even though my server crashed a few times) – I don't know where it was first published, but it subsequently got posted on many many other sites all over the world (more than 100). It even got translated into quite a few languages – here's for example a German translation: http://derstandard.at/1250691441783/OpenStreetMap-Die-Wikipedia-fuer-GPS-Daten?sap=2&_pid=13948206
This article (the first post) was published about 12 hours after opening up the website openmtbmap.org on the front page of mtb-news.de: http://www.mtb-news.de/forum/showthread.php?t=391414
http://www.stern.de/digital/telefon/topografische-karten-wandertouren-mit-dem-handy-703489.html – This article subsequently got printed in about 20 more news journals (amongst Süddeutsche Zeitung, Netzzeitung.de, Rhein-Zeitung, Sol.de, Südkurier,
Soulbikers use Openmtbmap on their Oregon.
Traditional Press mentioning Openmtbmap.org
Both the German "Bike" as well as "Mountainbike" magazine published articles about Openmtbmap.org.
Blog Posts about Openmtbmap:
http://niubii.blogspot.com/search/label/mapping%20tour – On of the most commited openmtbmap users
The very first blog post about openmtbmap.org: http://blog.spoony.ch/2009/04/07/mountainbiken-mit-gps-und-openstreetmap-teil-i/