Ha ha, nice job Ken. It made me smile when I heard you happy it was finally blinking. And we got some live troubleshooting as well! Good stuff. 

You know how I remembered which way a LED went way back when... One leg of the LED is cut off.  'Cut Off' starts with a 'C'.  So does Cathode.  The short leg is the cathode.  If you had your leg cut off, that would be a pretty negative thing. The short leg is negative. 

Just a little mnemonic device I made up to help me remember.  I still think of it to this day. 

Now, you just need to build one of the oscilloscope kits. You know, to see how fast your LED is blinking. 

See how I did that?  Its how we get more shows.  ;)