If you have them organized by folders on the PC, they will be in folders on the iPad. The way I do it is to make a folder called "iPad Pictures", under the "My Pictures" folder, and then create and/or move the folders you want, into the "iPad Pictures" folder. Then open iTunes and open the iPad device and go to the "Photos" tab, check "Sync Photos from My Pictures", then select "Selected Folders", then under "Folders" check "iPad Pictures". Uncheck anything you don't want transferred. Click Sync in lower right hand corner.
If you already have the pictures organized into folders under "My Pictures", then after you check "Selected Folders" just go to "Folders" and check the folders you want transferred to iPad. Click "Sync"
