If you have iCloud and you have Photo Stream turned on on both your iPhone and iPad, then all of the photos you take with your iPhone will automatically show up on your iPad's Photo Stream as well (pretty much everything on your camera roll).
Not sure if you were looking for anything else in particurlar? Albums that you have created on your iPhone will not sync via iCloud to your iPad. For those, you would have to sync them to your computer then sync them back to the iPad.
There is a camera connection kit that will allow you to transfer photos directly from a camera or your iPhone to your iPad, but the photos do not get put out there in any "album-like" format. I used the connection kit for awhile, but found that I had better results using Photo Stream and syncing to iPhoto on my Mac.
Hope that helps!