I'll add links here over time that I think may be useful to POTSies.
Organization websites:
National Dysautonomia Research Foundation
http://www.ndrf.org/index.htm
Dysautonomia Youth Network of America
http://www.dynakids.org/
Dysautonomia Information Network
http://www.potsplace.com/
Blogs by POTSies:
POTS Blog
http://www.potsgrrl.blogspot.com/
POTS Blog by several POTSies
http://thedysautonomiacs.blogspot.com/p/what-is-dysautonomia.html
POTS Blog by Sarah
http://www.potsawareness.webs.com/
POTS UK Blog
http://www.potsuk.org/
Dysautonomia Blog
http://hopealways.wordpress.com/
Other stuff:
Wikipedia POTS
http://en.wikipedia.org/wiki/Postural_orthostatic_tachycardia_syndrome
Spoon Theory
http://butyoudontlooksick.com/navigation/BYDLS-TheSpoonTheory.pdf