http://chip-chase.com/2011/04/18/using-digital-portfolios-to-enhance-learning/
This website is really useful when trying to figure just exactly how portfolios can be beneficial in the learning process.

http://newteacherniche.weebly.com/portfolio-possibilities.html
This website was created to give teachers a guide in creating portfolios, tips on what to do with them, and inspiration for what to put into portfolios. It is a nice one stop shop.

http://www.sagepub.com/upm-data/24497_01_Forde_Ch_01.pdf
Sage pub spells out what a professional portfolio is, gives examples of different portfolios, and explores ways to use the professional portfolios.

http://www.scholastic.com/teachers/article/professional-portfolio
Scholastic provides a brief description of how to create a professional portfolio and also provides links for guides for setting up a portfolio for different grades.

http://teachingcenter.wustl.edu/About/ProgramsforGraduateStudentsandPostdocs/resources/Pages/Creating-a-Teaching-Portfolio.aspx
This website provides strategies to make your portfolio effective in the classroom. It also provides tips on how to organize your portfolio.