SPAN vs TAPs ports

Some worthreading links that outline pitfalls when dealing with SPAN and TAPs:

http://www.lovemytool.com/blog/2007/08/span-ports-or-t.html

http://en.wikipedia.org/wiki/Network_tap

http://www.infosecwriters.com/hhworld/hh9/roc/node4.html

http://www.netoptics.com/lp/tapspan.asp