Basis power/ss calculator.
http://www.health.ucalgary.ca/~rollin/stats/ssize/

SS/power calculator with options for various types of analyses.
http://calculators.stat.ucla.edu/powercalc/

Site with a number of calculators
http://calculators.stat.ucla.edu

Has good examples.
http://www.biokin.com/tools/

Power calculation for ANOVA design.
http://www.math.yorku.ca/SCS/Online/power/