I was able to get pictures/music/videos from my USB drive.
First with the usb drive plugged into the computer, I created a file named PS3. Within the PS3 folder I created separete folders named PICTURE, MUSIC, and VIDEO. (within the video folder I created another folder named 100MNV01 only because that's the way it was set up on my PSP) I don't know if this is ALL necessary but it worked for me.
Next I copied the respective files that I wanted off my computer into their respective folders. I chose some photos and copied them into the PICTURES folder, songs into the MUSIC folder and so on. I had a home video that I copied into the 100MNV01 folder that worked.
Next I plugged the usb drive into the PS3.
I went to PHOTO, scrolled to USB drive, hit the triangle button, selected "display all", chose the PS3 folder, inside the PS3 folder I chose the PICTURE folder, hit the triangle button, and then chose copy. I did that with the MUSIC and VIDEO folders too.
It worked great. Maybe there's other ways to do it, but for now it got me where I wanted to be.