I have to say that I am not a fan of web-based resumes and portfolios.  Although some services push these, I do not see the sense in having them. 

The purpose of a resume is to get the employer to call you to schedule an interview.  Why then, would you want to give them an extra step to take before calling you?  If they are interested enough in you to look at a web portfolio, then they are interested enough to call you and find out more which is the preferred outcome. Web resumes and portfolios are appropriate for certain marketing and web development folks, but even then, I would save the url’s for the interview.