PDN posted online yesterday a video presentation [here] of a consultation between photographer Jamie Kripke and consultant Leslie Burns-Dell'Acqua, owner of Burns Auto Parts Consultants. In the videos Leslie and Jamie discuss key points to his portfolio, his website and his work in general.
I agree with Leslie that in portfolios there has to be a strong opening image and a strong ending, because if anything those are the two images that will be viewed the most by creatives in the portfolio.
Also she's right...plastic sleeves suck. Most portfolios still have them and we deal with it. The fluorescent lighting in offices is one of the main reasons plastic sleeves are bad. The other is people handling the pages everyday, there are fingerprints, creases, scuffs, and dirt that get left behind on the pages which makes viewing the images a tad difficult.
The other major agreement I have is keep the continuity of your brand succinct. Your website, portfolio, and promo pieces should all tie in together. A creative or art buyer never has to guess or be unsure of whose work it is and why it doesn't sync together.