Thanks, I can delete them after import, but I don't always remember to import the pics before syncing the iPhone. I usually sync after buying music or apps, and import after taking pics that I want backed up right away (which can happen at different times).
You're welcome.
If you sync prior to importing the photos and removing the photos after the import process is complete, the next time you sync your iPhone's backup will be updated to reflect the photos removed from your iPhone after the import process. Unless you regularly have a significant number of photos available in your iPhone's Camera Roll in between the syncs and photo import, this shouldn't make much difference. Are you running short on available hard drive space?
If this is important to you, you need to adapt a little and import the photos from your iPhone's Camera Roll first followed by deleting the photos from the Camera Roll after the import process is complete before syncing. This way no photos in your Camera Roll will be included with your iPhone's backup. If you don't do this every time, the next time you sync after importing and removing the photos from the Camera Roll will be reflected with your iPhone's backup.