Post your questions, suggestions and experiences regarding game design, integration of external libraries here. For irrEdit, irrXML and irrKlang, see the ambiera forums
Micropather is a free 3d a* class. Irrwizard implements it with irrlicht for ai, maybe you can have a look at the sources in irrwizard to learn about ai.
"Irrlicht is obese"
If you want modern rendering techniques learn how to make them or go to the engine next door =p
i have searched for ai libs but i didn't find because ai is different in each game and this is what programming is use your mind but if u want ai for path finding and enemy ai see the tile based tutorials it contains also good ai that because all strategy games are tile based games here:http://www.tonypa.pri.ee/tbw/