i heard 10-12 is good. mine has 13...lol i dont think there's a standard number
mine is more so a commercial portfolio (I have food, architechture, industrial, and products, still life), with a couple portraits because it shows i can do people/models because products/services can include people. plus, a lot of photographers have to do portraits as well because they also pay the bills.
i also made a CD portfolio using flash. which was A LOT of work. this is for the people i cant go to see in person.
i made a cd lables and jewl case lables. very simple looking, all clear case, had a nice effect. kinda cool. i also have minicds (business card sized so itll fit in a wallet or business car book)
I also have regular business cards and a resume (with the equipment I can use and own, awards, workshops, courses etc) that all gets attached together just incase
the CD autoruns an html file with links to either a flash player portfolio, or an html portfolio (all located on cd) incase they cant see the flash portfolio. and of course the autorun just works on windows :/ i dont have a program that does it for both. i read it'd be called a hybrid cd. *shrugs* I dont know anyone with a Mac computer to test this on either
someone way back said to put a good picture first and your best second (or last? i forget which). i put a colouful fun picture first, my best one second, and an awesome grand finaly (sp?) for the end that is one of my best photos.
i kept mine in categories as well.
this summer id like to add sports. baseball and maybe hockey or something sweet like ballet.
i may even try concert or a band (a friend of mine is in one).
goodluck!!!