Ok, so I've seen plenty of questions similar to this, and they all say "check the readme."
So I did.
As far as I've seen so far, none of the fonts specify whether a portfolio is considered personal or commercial use.
In my opinion, it's personal. You aren't selling your portfolio, you're showing it. So let's say I use someone's font in a web portfolio, would I be required to pay them for that use?

Its probably a lot to expect font designers to cover every single possible use in the readme file. I don't think it would be too hard to contact the author and ask them. I would think most people would consider it as personal use, but why not find out directly from the source?

If there's contact information in the font download, why wouldn't you contact the author instead of posting it as a general question on a forum? People can reply on the forum as to what their opinion is, but only the font author can give you the official answer.

in fact you are selling something in a portfolio... you

Anyway, even if you consider it as a personal use, why don't you donate some bucks to the author ? even 1$...
It's a way to thank him for his work, no ?

I agree with vinz: just donate the buck and you're home-free! I mean, all this bla bla and trying to get away with it when all you have to do is donate a bloody dollar! I mean, the font designers here spend A LOT of time making their font, so you can download and use them. Most of them ask for a small donation in return, which I think is only fair. Be glad that there is a thing like donationware, where you DO get the whole font and it's up to YOU how much you donate!

Thanks a lot guys. Alright, so maybe hoping for one general answer was a bit much. But you guys are definitely right. Again, thanks for the quick reply and thoughtful answers.