I am currently an ESL teacher - I teach 2nd, 3rd, and 4th graders. Here are some of the websites I have found to be helpful:

http://www.everythingesl.net/
http://www.eslcafe.com/search/Lesson_Plans/
http://www.eslpartyland.com/
http://iteslj.org/links/TESL/Lessons/
http://www.englishclub.com/teach-english.htm
http://members.aol.com/Jakajk/ESLLessons.html
http://iteslj.org/links/TESL/Handouts_for_Classroom_Use/
http://www.eslgames.com/edutainment/#redirect
http://www.lingolex.com/userpages/Ernie.html

i know alot of websites that you could download illegal lesson plans but im sure your a good citizen and won't make good use of them :) lol

try www.ESLDesk.com