OK, so I pulled the crank arms off and I've concluded that its definately the spindle thats bent-twisted.

The crank arms and taper part of the spindle are in good shape. I put a spare set of crank arms on the spindle, and the same thing...the left one is rotated forward, so it must be the spindle, not the crank arms. Next, I put my crank arms on another bottom bracket spindle that I'm not using and they are perfectly straight. So I must conclude that the spindle currently on my fixie is twisted-bent.

Hard pedal strike, crash, or random acts of violence are out of the question...haven't had anything like this happen, and I don;t park my bike outside, so vandalism is ruled out as well. Several weeks ago, I took apart the BB and lubed the bearings (its a cup and cone) and everything looks fine. I bought this bike used (old Bianchi road conversion), so I suspect it was bent all along and I just now noticed it. Nothing else looks damaged however; possibly the current spindle is not the stock spindle.