More things lost (not mentioned here before):
- Ability to hold down alphabetic keys and have them repeat
- Support of second (or third...) monitors diminished with new Full Screen mode and new Spaces
- Spaces can no longer be set up on rectangular grid
- Reduced functionality and accessibility of Application Expose
- Probably new systems will not come with a reinstall DVD (yet to be seen)
- There are reports of reduced battery life and greater memory footprint (loss of some available RAM for applications).
- Lion Server is missing many services that were in Snow Leopard Server and some services have been reduced in features.
I fear these may be the deal breakers for many people looking to upgrade.