Exported files appear very pixelated

Hi,
Today I tried exporting some photos from iPhoto using both the File > Export command as well as using the "Mail" toolbar button to export photos to Apple Mail. I set the export option to use the highest quality JPG but to reduce the file size to a "medium" setting.
The resulting file, for every photo that I exported, was very pixelated and the overall quality looked very poor. Even with the photo zoomed at 100%, I could easily see pixels.
I tried doing a similar photo size reduction in Photoshop and the final files look great. I was hoping to use iPhoto for quick and easy exports when I want to reduce the file size (such as for e-mail) but am not having luck with the pixelation.
Any advice?

Terence:
If your pixel count was the same as Neil's, or very close due to the different aspect ratio, the the dpi value is of no consequent. It only means that if printed at that value, your print would be 2.5 times smaller than Neil's.
I exported a 2625 x 1969 pixel image with the max quality and medium size. Upon opening in Photoshop it read 640 x 480 but with a dpi of 656.25 dpi. The print size was 0.975 x 0.731 inches. The total pixels were the same as yours. I then exported a 1600 x 1200 file at medium and got a 180 dpi reading in PS. Same 640 x 480 pixels. Don't know why PS handles them differently.
Neil:
Have you, in the past, been able to export the medium size and have it acceptable? Is this just since iPhoto 08? Try deleting the iPhoto preference file, com.apple.iPhoto.plist, that resides in your User/Library/Preferences folder. See if that will help.
Do you Twango?
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've written an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 08 libraries. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

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