Same tutorial as for blender 2.4x, but with the new exporter (2.4 exporter is not supported in Blender 2.5x).
For blender2ogre installation procedure, check this post:
http://www.scolring.org/forum/viewtop...
On this page of the site you can watch the video online Blender 2.5x basic mesh export tutorial with a duration of hours minute second in good quality, which was uploaded by the user Openspace3D 01 June 2011, share the link with friends and acquaintances, this video has already been watched 22,011 times on youtube and it was liked by 41 viewers. Enjoy your viewing!