Palms..............
Fairchild guide to palms
http://palmguide.org/index.php
Palmtalk.org
http://palmtalk.org/cgi-bin/forum/ikonboard.cgi?
Bamboo...........
Mr. Bamboo (entertaining and informative)
http://www.mrbamboo.com.au/bamboo_main/bamboo_main.html
Bambooweb.info
http://www.bambooweb.info/
Rating online nurseries and all kinds of other useful info
http://davesgarden.com/
This thread would make a good sticky.