I have found a WONDERFUL website to learn all about sourdough!  I highly recommend it!  Go to http://www.sourdoughhome.com I have decided to attempt keeping and using sourdough again.  I had made a few loaves these last 2 weeks but wasn't really impressed with how they turned out  But here I am, at it again.  I was afraid that my starter had gone bad, but they say that layer of liquid on top (called "hooch" and apparently some old "sourdoughs" actually drank the stuff!  Ugh) is okay, just mix it back in or pour a little off.  Anyway, I just made some sourdough french bread for Glenn and they're just beautiful!!  I have batter souring to make sourdough English muffins tomorrow.  Yum!!  I would love for this to work out well and I could be using it continually.  They say the older the starter is, the more powerful it gets.