"Well, it missed the original rumoured deadline (last Thursday), but it's here now - v21.0.045 firmware for the Nokia N97 (classic), available via NSU as a 143MB download, featuring 'better call reliability and smoother touchscreen scrolling'. Comments welcome if you can add to the changelog/overview below. In view of the limited free space on disk C:, see below for my installation recommendations. (The previous firmware version was v20, the first to bring in Symbian^2-like full kinetic scrolling in all screens.)
The software contains many fixes and improvements on the earlier releases including:

•  More free RAM after booting 
•  Improved call reliability
  
•  Smooth touchscreen scrolling
  
•  Browser improvements (among other changes, the toolbar stays out of the way more)
  
•  Music player improvements
  
•  Cleaner default (black) theme
  
•  Improved image and video stability 

• After a hard reset, there's now 53MB free on disk C:
  
• After removing the Facebook and AccuWeather homescreen widgets, the N97 now boots up with around 59MB of RAM free
  
• Disappointingly, Ovi Maps 3.3 (free) isn't in the firmware, though of course, it's an easy add-on from 'Software update' on the device, from maps.nokia.com or from the Ovi Store." via allaboutsymbian.com