Just finished reading 20+ pages of posts in this thread. Looks likes cyclists find more things than drivers, maybe because we travel at slower speeds and can observe all the things around the road.

I have found a nice pair of Oakleys with gold iridium in the bushes. It caught my eye because the sun was reflecting off the gold lens.

I have also found laptop, with manuals, carrying case, power supply... opened it and saw the lcd screen had a massive crack. Other than that it was running fine, I just hook on an external monitor and was able to use it for a few years.

I found a small black plastic bag under the seat of the bus stop. Inside was some make-up kit and a Olympus camera. It was one of those waterproof, shockproof camera which came in handy on offroad rides.