I sometimes find myself reading a very insightful comment, or an unbelievably funny one, or even a deliciously sarcastic quote (usually from Irridium or Vault101), and feeling bad for not being able to thumb them up to let them know they are doing a good job. It would be cool to be lurking in a thread which doesn't interest you, seeing a very good post, and being able to compliment the poster without going OT?