Listen to this morning's class on "Torah Lishmah - Hasidim vs. Mitnagdim" here. Follow along with the sources here.
For further research:
1) As mentioned, the classic book on this topic is R. Dr. Norman Lamm's Torah for Torah's Sake.
2) R. Reuven Raz recently published הרב קוק בין חסידים למתנגדים, in which he probes Rav Kook's thought for his stances on classical Hasidim vs. Mitnagdim debates. Chapter 6 deals with "Torah LiShmah." Read the part relevant to Rav Kook here.
3) R. Elyakim Krumbein has authored an entire series on the topic of "Torah Lishmah," published on Har Etzion's Virtual Beit Midrash - explore it here.
3) R. Elyakim Krumbein has authored an entire series on the topic of "Torah Lishmah," published on Har Etzion's Virtual Beit Midrash - explore it here.