I need to know what are the essential things that one web designer must have on his/her portfolios or things that really make a difference...the following is what i think is a good starting point. but would like to get confirmation and further tips and examples of professional portfolio also some general idea of new trends that are in for portfolios.

• I know it should show some focus toward certain niche.
• Have best examples and not like 50 pieces.
• Blog to show off other skills, and that he/she is keeping up with trends.
• Site Works on tablets.
• Look very well designed, especially if you are a designer.
• Give example of wrokflow and results.
• Preferably has worked out with one or two clients who have gotten great results.
• A way to quickly engage and get response.
• An outlet to network with other designers/developers.
• List of other designers/developers that you recommend and that they recommend you back.

what more...