I discovered my Activity is leaking on the ICS emulator. HProf seemed to show SpellCheckerSession keeping a reference to my Activity around, and there appears to have been a fix:
https://github.com/android/platform_frameworks_base/commit/df3722895172e03c81787f62d922daabaad3e20b
But is there any way to work around this in the mean time? Can I disable spell checking somehow?