Portfoliopad.com still isn't an image hosting site, if I'm correct. So you still have to upload them to imageshack or imagebam or postimage or something before you post it here.

^ Do you know if it is one of those sites where members can pay for image storage?

Actually, it's main use is to help agencies develop websites. This is the description from their website:

Portfoliopad is a web-based software application designed to market models, talent, artists, reps and locations using the most powerful marketing medium – visual presentation. Submit digital packages to your clients and include images, video clips, polaroids and resumes.