I've found a gold ring (worth 150 bucks).
an Ipod. worth nothing.
About 20 bucks in change (I've been running for awhile)
and a bag of unopened doritos.
But most of my running is in college areas and big cities so this isn't that surprising.
The most interesting thing I found not on a run, but on a walk back from the gym after a basketball game was a jump drive about 4 years ago. The drive was cracked and broken but the port was still undamaged as was the chip inside the jump drive. Incredible things were found on this jump drive. I think they belonged to a frat boy but there was no name so nothing could be done about it.