There's a lot of really cool photo manipulations you can do to create amazing pics. I really like playing around on bighugelabs.com - that was my favorite site. I spent a lot of time with my own personal pics. I had never known about these sites and think it's great they are free to use. You can do a lot of neat stuff for presentations or self promotion. You can really show what you know how to do with these tools.

I have mixed feelings about sharing photos online. I don't mind ppl having access to professional photos but I would not put my own personal photos of family and friends online for everyone to see. If you are taking a logo from someone I think there could be copyright or licensing issues but if someone uploads a pic online, they are authorizing it for ppl to use.