If I ever get the time again I'd like to rebuild the built-in syncing to work seamlessly as I would expect - without annoying limitations like only supporting a single Activesync connection, for example. I hate having to use apps like syncevolution as bodges to work around the built-in stuff. I just want to have an item in the control panel that lets me add any number of sync profiles and just set their type.

...that and reimplementing the closed source UI bits of the address book and calendar so you can actually express the synced stuff properly!

One day. ...one day.