Some of the ones I found particularly interesting that are/will be settled this decade:
Bet 12 (https://longbets.org/12/) - No one will win a Nobel Prize for string theory by 2020
Bet 1 (https://longbets.org/1/) - The Turing test will not be passed by 2029
Bet 4 (https://longbets.org/4/) - Pilotless passenger planes will be routine by the end of the decade.
Bet 712 (https://longbets.org/712/) - A commercial driverless car service will be available (in Las Vegas)
The site was also somewhat notable for the "million dollar bet" (https://longbets.org/362/) between Warren Buffet and Protege Partners about whether a curated portfolio of hedge funds would outperform the S&P500 over a ten year span.