A new firmware, 7.24.0.3, is now available via the Nokia Software Updater for the Nokia E90. Details of some of the updates are in the comment thread, please add your own. In other E90 news Nokia has also recently added support for the Nokia E90 to its iSync page (also available for most other S60 phones).

Mac OS X  Sync

iSync allows Mac OS X users to sync their contact and calendar information and together with Nokia Media Transfer offers a complete Mac solution for S60 phones.

E90 Firmware Update 

 

Remember if you're upgrading your firmware you should closely follow the instructions. It can be worth checking for an update more than once as sometimes the phone is not recognised. 

Thanks to JD for the notification.