smartbody may be of use to you, it has ogre rendrer integration example....
http://smartbody.ict.usc.edu/
now about knowing more, you'll have to be more specific...
i can just say that just like the matrix-2( aka "return of the Vector" ) knowlege has a price=takes lots of time and other stuff( coffee etc.. )
problem with ogre- its a bit messy, projects are scattered around and you have to dig a lot in the forums...
other thing is that ogre2.1 is very different from 1.x( in api and in concept ) so lots of projects/code/tutorials/docs needs upgrading/rewriting( you can do it yourself with the help of ogre 2.1 porting guide, or wait hoping for someone else to do it )
anyway a quick welcome tour...( search links yourself... )
ogitor( the unofficial amazing MIT ogre scene editor )
magus- new promising project to help you write your own editor with very little effort( generates code for you... )
mygui/cegui/librocket/navi/gorrila=ogre gui libs( mygui is the best, gorrila is the fastest but basic )
ois=ogres unofficial input lib- used in samples - being replaced by sdl2
particle-universe( aka PU )= alternative particle system with node editor
ogreProcedural= create and combine procedural geometric meshes
btOgre/ogreBullet/nxOgre= physics binding to ogre
moc/new moc= minimal ogre collision lib
ogreAL/ogreOggSound = openAL bindings
ogre-ffmpeg-videoplayer = video to ogre texture using ffmpeg
smartbody- character animation platform( highly advanced stuff... lgpl ) has ogre integration/renderer samples
technofreak animation system- ogre animation blend trees with a node editor( editor is in c#/ runtime is in c++ )
recast/detour -path findimg lib- has a complete example/integration with ogre in a project named ogreCrowd( hosted in bitbucket-ogre addons repo )
skyx- realistic vulumatric cloud( heavy on cpu/gpu ) and sky system( you'll get lots of kudos if you port this to 2.1 (-: )
hydrax- realistic water/ocean rendering( reflection/sun/underwater etc... ) also needs porting to 2.1
caleum- lightweight weather/time/athmospere/star system( rely's on real data )
ogre/ogre addons/ogitor snapshots - kindly maintained by transporter( to reduce building time )
http://www.ogre3d.org/forums/viewtopic.php?t=69274
ogre wiki= tutorial/code sniplets etc
ogre sampe browser - good source of knowlege- but a bit messy for basing your project upon
lot of other libs/stuff...just ask in the forums...we're here (-: