I don't hear any ringing or tones, but when things are silent, I seem to notice a very slight hush that I don't remember always having (but then again, I might just not have been aware of it in the past). If it is tinnitus, it's very minor. If not, well, I have no way of knowing it's normal unless someone wants to borrow my ears.
Oh, and for those interested, This American Life had a bit on tinnitus this week (the streaming version should be up by Monday morning).