In what has to be one of the earliest times in race history, registration for the Boston Marathon has closed as of January 26th 2007.
According to the Boston Marathon Web Site:
"Registration for the 2009 Boston Marathon has closed as the race has reached its capacity.
The Boston Marathon does not have a waiting list, late registration on race weekend, or race day registration.
The names of all official entrants are published on the B.A.A. web site.
Please note that bib numbers are not transferable. Those attempting to transfer their bib numbers, as well as those in receipt of a transferred entry, will be disqualified.
The 114th Boston Marathon will be run on Monday, April 19, 2010; the B.A.A. tentatively plans to begin accepting applications for the 2010 race in September 2009.
Qualifying times obtained after September 27, 2008, can be used to compete in the 2010 Boston Marathon."