Statistical Power Analysis Web Tools (a very small sampling):

Wikipedia Entry for Power Analysis:
            http://en.wikipedia.org/wiki/Statistical_power

On Line Text from StatSoft:
            http://www.statsoft.com/textbook/stpowan.html

Getting the Sample Size Right (Jeremy Miles Co., UK):
            http://www.jeremymiles.co.uk/misc/power/index.html

Russ Lenth’s Power and Sample Size Calculations Page (Univ. Iowa):
            http://www.math.uiowa.edu/~rlenth/Power/

On Line SAS-based power analysis tools for ANOVA designs (Univ. of York):
            http://www.math.yorku.ca/SCS/Online/power/

Sample Size Calculators (Harvard Univ):
            http://hedwig.mgh.harvard.edu/sample_size/size.html

Power and Design Resources on the Web (StatPages.net):
            http://statpages.org/

G*Power Freeware for Mac and PC (Univ. Duesseldorf):
            http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/

Miami University, On-Campus Resources:

Statistical Consulting Center –
            Web Site: http://www.cas.muohio.edu/scc/     
            Contact: Michael Hughes, Manager <HughesMR@MUOhio.edu>

Excel Spreadsheet for Simple, Two-sample Comparison Calculations:
            Web Site: http://zoology.muohio.edu/oris/iacuc/poweranalysis.xls
            Contact:  Jim Oris, IACUC Chair <OrisJT@MUOhio.edu>

                                                                                               
(links confirmed 25-September-2007, J. Oris)