Nokia has recently issued firmware updates for its N78 and N82 handsets.
The latest N78 firmware v20.149.051.1 updates Nokia Maps to version 2.0 and makes UI more responsive. Full change log can be found at DailyMobile.se.
N82's latest firmware version 31.0.016 adds UDP (User Data Preservation), and updates Nokia Maps, making the application more stable. For more details visit AllAboutSymbian.
Other improvements include overall stability enhancements and bug fixes. Backup your data before updating.