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All that may have changed – and BetUS offers you the bet it might have – in late May with Microsoft’s release of Bing.com, an alternative search engine locked into new Internet Explorer 6 browsers. Even with Microsoft backing the enterprise, though, how popular can a search engine David be against the Googliath? You might be surprised enough to pony up a bit.

That’s why they play with the big bucks, i suppose. Within 24 hours of writing this post on some seemingly too-long odds over at Paddy Power in the bookmaker’s intriguing “Highest-ranking social website by 2011” specialty bet came news from metrics specialist firm Nielsen Online of Twitter.com’s low rate of return visitors and thus justification to put fad-of-the-year Twitter, a website with over 1,000% growth year-on-year, at 9/4 odds in the proposition.

Paddy Power’s “Highest-ranking social website by 2011″ prop bet pits five ’sites against one another, but has the bookmaker unwittingly posted a super-easy wager?

Think we’ll land a man on Mars by the end of the next decade? Intertops has got some intriguing “Mission to Mars” proposition bets for your perusal, then, though George W. Bush setting foot on the Red Planet does seem like a bit of a stretch…