Race coverage will be rolling along all day here and also over at SBNation Boston. Getcha popcorn-flavored gels ready.
RELEVANT: Streaming video available free here from Universal Sports HD.
To get an idea of today's weather, check out Amby Burfoot's rundown of what effects heat may have on runners.
Beyond Burfoot's piece, check out Alex's roundup of studies on heat and athletic performance.
It's never bad to look back and learn from similar races; Chicago in '07 seems like an apt comparison. It was a touch warmer in Chicago than the forecast high for today, but both temperatures are unseasonably warm (and uncomfortable!).
And don't forget: there's a post-race event sponsored by Samuel Adams at Fenway Park, which just might be the 'most Boston' thing possible that doesn't involve Ben Affleck.