Howdy..I'm Fernando and i'm also a victim...
Mine came in the form of working full time, going to school full time, and training/doing the four main Texas marathons this past season. By the time Dallas came in the week after finals, I was practically burnt out. The thought of getting out of bed
again at 445am to do a run followed by work, school, work, homework, maybe a ride, get home around 9pm or later...only to repeat it again the next day. By the time the weekend came around, I was drained and actually didn't look forward to the weekend at times because of having to wake up early again for a run or ride. I sometimes would even just turn the alarm off and roll over...then guilt would kick in, I would get up and go do the event.
It's one of the reasons why I haven't been running as much...I just got burned out. Since I haven't worked since the end of March, I've been trying to focus a little more on swimming, strength training, cycling, and adding a little variety really. Plus making time for mental me time has helped quite a bit. Now that I have decided to do only the Houston marathon as the only full marathon I do each year, it's time to focus on running a little more again to get my time down.
My burnout was more of a mental one though my body did at times cry uncle...but variety and time off helped a lot in keeping the sanity rather than just fully getting burned out and not wanting to do it again. I totally agree with Joe (who is this guy anyway?

) that setting goals has helped me as well. If all goes well, I do want to qualify to do Kona Ironman in 2012. I do have a lot of work to do before I get there, but it's a goal I have. This translates to me having to do my first half for the start of 2010 and also qualify for Boston in 2010. Lots of work but finally have smaller goals set to get to these major ones.