The new software release for the Nokia N900 has a lot of fixes in it but it also contains new features such as exchange 2003 support, Hutchison SIM cards are now supported.
All the fixes you can find in the change log further down in the post.

During the Maemo summit today there was several news regarding Maemo 6 that Nokia hinted at during the event. Some stuff that they revealed to look forward to was landscape and portrait support, capacitive touchscreens,multitouch also there is a concept photo how the UI could possibly look like.
Maemo 6 will probably be out late 2010 or early 2011 and there is sometime before we can enjoy this new Maemo version.

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This video is showing off QT running on a Nokia N900 and features a deep Maemo integration and hardware acceleration using opengl ES 2

Nokia have officially announced the Qt port to Maemo 5 and you can check out the full press release bellow.

Developers will be able to target the Nokia N900 and upcoming Maemo and Symbian devices.
Espoo, Finland – Nokia today announced the creation of the official Qt port to Maemo 5 and published an initial Technology Preview release. This port to Maemo 5 means that developers can now use Qt to target the upcoming Nokia N900 device and also ensures that applications can be easily ported to all Qt’s supported platforms including …

This review goes in depth about the MAEMO 5 OS and it’s well worth the read through and the features included in this OS is remarkable good and it also looks stunning.
Nokia’s latest and greatest software platform, Maemo 5 didn’t come out of the blue – it had been in the works for quite some time, but ahead of it lies an even longer journey. I’m not going to repeat what I said about its origins and philosophy – those of you who are not familiar with them yet should …