Beginner

I'm still a beginner when it comes to long distance running.  I am learning what works for me, but I still have a lot of trial and error ahead.  I do know that running twenty miles two days after a brutal stomach flu isn't a great idea and that not eating frequently on a three to five hour run is ill advised. However I certainly don't claim to know it all.  Here are a few things I've read time and time again attempting to figure it all out.
For the beginning Ultrarunner
How to train for your first 50K
Ultramarathon Running