Views.fm Dropbox viewer offers slick galleries, and adds commenting
Views.fm connects to Dropbox, and then lets you create public or private shares of your folders. Public is self-explanatory: it gives anyone with the link the ability to browse and download the contents of the shared folder. Private shares are only accessible to people you invite via email, and you can see and edit who has access right from your Views.fm shares list. Private shares also enable comments, both on the folder itself and on the individual files.
If you want to use Views.fm as a portfolio, just share a folder full of images, and the rest is taken care of for you. Pretty slick indeed.