Submitted for your entertainment is this poll and thread. I'm accepting guesses for what the peak US average will be for calendar year 2010. The following chart should auto-update so we will be able to track it in this thread. Chart is from Gas Buddy (GasBuddy.com - Find Low Gas Prices in the USA and Canada or iPhone app "Cheap Gas!")
This is a tough call because the economy is still in the crapper. However, here in Sacramento the price of unleaded regular is already climbing and is between $3 - 3.07 at the top tier stations (Shell, Chevron, etc.)