One weight of Museo Slab is free : http://www.myfonts.com/fonts/exljbris/museo-slab/

Also, consider Sanchez : http://www.myfonts.com/fonts/latinotype/sanchez/

And for "BANNERS"

Similar.

You're welcome

You're welcome It's hard to be 100% sure, of course

That "S" definitely looks like Berlin Sans.

"Portfolio"

Again

Sure, but your sample is too small and fuzzy to be 100% sure. Be patient please, and don't bump your topic every 30 minutes. Someone might come with the answer. If not, well, that's life.

Oops

Well, the thing is, not every website is as "author friendly" as dafont is. Take this thread for example. Many websites just "suck" the content of others. You can still try to contact the webmasters behind these kind of websites, but honestly, I'm pretty sure it would be too much time consuming, for a result that will be very disappointing.

Then, of course I understand it's very frustrating to see this kind of things. But take a look at it this way : [Hollywood trailer voice] They used your font without the legal authorization. They're wrong. They're big. They should have done the right thing. They didn't. Now you're mad and asking for revenge. [HTV off]

If I were you, I would just show up - even by email, uh, you don't wanna be stalking - and say "Hi, I'm [put your name here] the guy you stole from. As you wouldn't like me to download your music illegally, I don't want you to use my font illegally. But hey, I'm sure we can find an arrangement (please note that my Bank Account [put number here] doesn't accept CD from whatever artist is on your label, but only Dollars with some zeros). [add some lawyer stuff]. Yours sincerely, kiss on the cheek, [Sign]".

I'm pretty sure they'll be comprehensive. Then you can walk the street with a t-shirt "I'm the guy who designed Justin Bieber's font"

Unfortunately, you're neither the first, nor the last person, to whom this will happen