Crescent of Venus with the naked eye--lots of reports, nothing absolutely convincing. Just try google for lots of hits.
The visibility of Jupiter's moons is more authenticated. They are around mag 5 and would be easily visible away from the glare of Jupiter. Callisto can get as much as 10' from Jupiter and reports suggest that hiding Jupiter behind a convenient pole is the best way to spot it naked eye. Interesting article here about the best time to try for a naked eye hit
http://astroblogger.blogspot.com.au/...ers-moons.html
Geoff