Mrs. Flannagan's Kindergarten Lots of center ideas for math and reading http://www.littlegiraffes.com
Alphabet Stamps for spelling center I used this one successfully http://ilovethatteachingidea.com/ideas/010412_alphabet_stamps.htm
Literacy Center ideas http://www.canteach.ca/elementary/beginning10.html
Simplify Centers !!!! Easy, fun and inexpensive centers and how to run them http:/mspowell.com/centers.htm
How to set up centers in your room http://abcteach.com/Extras/centers1.htm
Teachers Heart Learning Center Page This is packed with ideas for centers http://www.teachingheart.net/LC.htm
Fill in the Missing Number Math Center (suitable for k-2) Printables available for printing http://www.fortunecity.com/millenium/taunton/1037/teacher/missingnum.html
Kindergarten Teacher Center Ideas http://www.bainbridge.wednet.edu/blakely/staff/jcolby/aboutourclassroom.html
Center Signs You Can Print For Your Room http://abcteach.com/directory/teaching_extras/classroom_signs/
ABC Centers at Hubbard's Cupboard Great for Kindergarten http://www.hubbardscupboard.org/abc_centers.html
Using Centers With Guided Reading This site has 22 weeks for learning center ideas to print http://www.msrossbec.com/literacy_index.html
Carl's Corner of Center activities Get center directions, activities, and activity charts to print for use in your classroom http://carlscorner.us.com/centers%20City_4.htm
Literacy Boxes In First Grade (this site has printables, ideas, pictures, etc....) http://www.mrsmcdowell.com/Literacy%20Boxes/boxes.htm#Spelling
Literacy Centers Ideas http://www.ourschoolfamily.com/Literacy%20Centers.htm
kindergarten Learning Centers Ideas from Kindercrew http://www.thekcrew.net/units.html