+ Google-Sync included (Contacts, Calendar, Tasks, Picasa, Gmail, Google+, ...) - never loose my Data again
You didn't get the way how multitasking works on Android, did you ? There is NO need to close Apps, NO need for Taskkiller's, Android will close Apps by Priority when the System runs out of memory. The Home-Butten is equivalent to X-Button on N900, but there are also many Apps you can close completely by "Menu" -> "Exit"/"Quit"/"End"