ES earch "found 643 matches: +eMTB" (First time, May, 2007)
ES earch found 25 matches: +eMTB" (in message/thread title)
(going back to this one from November, 2008)
One posting on a forum for the Hoosier Mountain Bike Association ("The mission of The Hoosier Mountain Bike Association, a Chapter of the International Mountain Bike Association (HMBA-IMBA) is to promote responsible mountain biking and work towards the goals of common land access, and natural resource protection, through local (Central Indiana) and statewide relationships and initiatives.":
http://www.hmba.org/smf/index.php?topic=14216.0
... commented in November last year "there is not a definition of eMTB's".
Although for most folks may seem to mean electric "mountain" bike. One definition " all-terrain bicycle created for off-road cycling."
Which may sound strange for one URBAN biker used to mostly asphfalt and concrete pavements.