I'd have to say spring (late March/Early April, March Madness, Baseball....followed closely by Sept/Oct ...3rd place Christmas/New Years , bowls and nfl playoffs
March is the best, Tournament and baseball starting up immediately after it.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
From Christmas time through New Year's Day (About Dec. 17th through Jan 8th) You have the bowl games, college hoops, NHL, NBA, NFL playoffs, BCS Bowl Games, and the BCS title game. Not to mention conference hoops begins to really heat up.
May/June. Nothing beats the NHL playoffs and the NBA playoffs get better in the later rounds. January is good too, bowl games and NFL playoffs, all sports in full gear except bases.
The day before the college football season starts. So i guess that means september. Bowl games are great, but it also reminds me that the season is almost over.