The following websites may provide useful information about sampling methodology: 

National Post-School Outcomes Center
http://www.psocenter.org/Docs/PSOSamp112205.doc
 

Sampling Training
http://www.dssc.org/frc/sampling_training.htm

StatPac, Inc.
http://www.statpac.com/surveys/sampling.htm
 

University of Michigan, Institute for Social Research, Program in Survey Methodology
http://www.isr.umich.edu/gradprogram/ 

Childcare and Early Education Research Connections
http://www.childcareresearch.org/servlet/DiscoverResourceController?displayPage=datamethods/survey.jsp

Research Methods Knowledge Base; Cornell University
http://www.socialresearchmethods.net/kb/sampling.htm

Indiana University Center for Survey Research
http://www.indiana.edu/~csr/whoweare.html

Sample Size Calculator: Creative Research Systems
http://www.surveysystem.com/sscalc.htm

Probability Sampling : Ryerson University
http://www.ryerson.ca/~mjoppe/ResearchProcess/ProbabilitySampling.htm

http://www.deakin.edu.au/~agoodman/sci101/chap8.php#RTFToC3

American Statistical Association: Survey Research Methods
http://www.amstat.org/sections/srms/

Expert Survey Systems, Inc.
http://www.expertss.com/sampling.html

Statistics Canada Quality Guidelines
http://www.statcan.ca/english/freepub/12-539-XIE/steps.htm 

Some Helpful Websites about survey administration modes:

University of Michigan, Institute for Social Research, Program in Survey Methodology
http://www.isr.umich.edu/gradprogram/

SPSS: Ryerson
http://www.ryerson.ca/~mjoppe/ResearchProcess/ThreeKeys.htm

Childcare and Early Education Research Connections
http://www.childcareresearch.org/servlet/DiscoverResourceController?displayPage=datamethods/survey.jsp

Worcester Polytechnic Institute
http://www.wpi.edu/Academics/Depts/IGSD/IQPHbook/ch10h.html 

Florida State University Information Use Management and Policy Institute
http://slis-two.lis.fsu.edu/~cmcclure/network/Part-IV.html 

Expert Survey Systems, Inc.
http://www.expertss.com/administer.html  

PDF article by T. Brashears at Texas Tech University (internet surveys when email addresses are available)
http://www.depts.ttu.edu/aged/research/brashearssuveyabstract.pdf

Colorado State University – strengths and weaknesses of various survey methods
http://writing.colostate.edu/references/research/survey/pop2b.cfm

Introduction to Data Collection and Analysis with specific information on surveys
http://www.deakin.edu.au/%7Eagoodman/sci101/index.ph

Link on Measurement Methodology of NCSEAM Survey:

Institute for Objective Measurement (Rasch)
www.rasch.org