Does tweaking iPhoto prefs file produce higher quality?

I'm about to order some books & calendars. In older versions of iPhoto there was a simple hack that was recommended to produce higher quality products. It involved editing the iPhoto prefs file and changing the dpi settings.
Is this still recommended for iPhoto 08? If so, where can I find the instructions?
Any other tips for a first-time photo services customer?

Steve M:
It's no longer necessary as iPhoto 7 has set the resolution to 300 dpi for all book sizes.
Happy Holidays
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 created 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 and Leopard. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

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Does tweaking iPhoto prefs file produce higher quality?

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