In this thread, you will find commonly accepted rules and examples of successful portfolios for the games industry, so you can build your own.
The original post will be edited as more examples are provided. For specific feedback on your own portfolio, please create a thread of your own with your site.
Resources
Wordpress: Easy blog making software
Carbonmade : Easy website making software
Krop : Easy website making software
CSS Reflex 13 free wordpress portfolio themes
Podcasts
Articles
Sloperama article on how to apply for a job
GameCareerGuide's article on portfolios for level artists
Smashing Magazing on how to create a successful online portfolio
Smashing Magazing on using Wordpress for your portfolio
Jon Jones : Your portfolio repels jobs
Presentations
GDC 2010: Jacob Minkoff (Naughty Dog) PDF presentation on building portfolios