Triangly will use Dropbox API to build on-line portfolio from graphic files located on your Dropbox/Applications/Triangly folder. Each user will have custom domain (e.g. joe.triangly.com) with a few customisation options, like main color, name and contact details. On our website you can see the small preview of final look of the portfolio. We plan to invite first users within 2-3 weeks.
If you want to get peoples email addresses you're going to need to add more info about the service.