Until the congressional postal service improves, e-mail is the very best way to get in touch with them.

To get to all of our U. S. Senators alphebetically, this is the link
http://www.senate.gov/senators/index.cfm

To get to all of our U. S. Congress alphebetically, this is the link
http://clerkweb.house.gov/mbrcmtee/members/housemem.htm
 

Senate
Larry Craig's e-mail           http://craig.senate.gov/email
 

Mike Crapo's e-mail           http://www.senate.gov/~crapo/email.htm

House
Mike Simpson's e-mail       http://www.house.gov/writerep/

Butch Otter's  e-mail          http://www.house.gov/otter/contact.htm