Sycing from iTunes
The standard way of downloading photos to the iPad is to use the same syncing mechanism that you use when bringing music and video over. Start by plugging in your iPad to your computer as if you were going to sync it. Select it from under the Devices heading in the left hand panel of iTunes, which brings it up into the middle. Go to the far right tab that says Photos, directly to the right of Books.
This will bring up the photo syncing options, and you will then have to check the box next to “Sync photos from" option. Once you do this you will have a couple of options.
First, the folder option in the pull down menu is set to Pictures. It can be reset to iPhoto or a folder that you specify. If you change it to iPhoto, or another folder, you will have the option to choose “All photos, albums, events, and faces" or “Selected albums, events, and faces, and automatically include" and then events by their date.
Below you will find the available albums and events for the given folder, which for iPhoto may be things like “Last 12 Months" or “Last Import." Once you select the specifics you want, or just images more broadly, you will hit Apply. This will mark the change and initiate the sync of the iPad once again. It will copy the photos from the computer over to the iPad, and they will now be accessible in the Photos app under the album name that you imported it in from.