In iPhoto, create a new album called “iPhone photos.” (File->New Album). Then drag and drop selected photos from the iPhoto library on your computer into this album.

Connect your iPhone to the computer and open iTunes. Under the tab “Photos” check the box “Synch photos from iPhoto” and the box “selected albums.” Then scroll down the list of albums and check only the album called “iPhone photos.” Synch your phone.

All the photos on your iPhone will disappear, except for the photos on your “Camera Roll,” and a new album - “iPhone photos” - will be there.

You can add to, delete, or change the photos on your album, just by changing the contents in the iPhone photos album in iPhoto.