The pieces you care about:

• Domino Designer is now FREE for anyone - and its a pleasure to use
• Traveler supports iPhone mail, calendar, task, and personal address book sync
• XPages works locally in the Client
• Lots of XPages and Composite Applications (CA) fixes and enhancements
• Symphony toolkit with LotusScript and Java support
• OpenNTF.org will get a bunch of the out-of-box templates donated. You can now officially use these templates as part of your projects - and have them committed to the catalog. This includes Vince's OpenNTF.org mail experience and much more.

What is your favorite feature in 8.5.1?