With the Nokia N900 will be upgraded MeeGo (maemo6) outgoing message ( press review ), and now burst out of the N900 Internet PR1.2 new firmware updates, and who has introduced one after another, constantly surprise! 以下是 PR1.2新版的更新内容。 The following is PR1.2 new version updates.
The following is the new N900 firmware updates PR1.2 English original content:

It will support internet video calls. Straight from contacts. It will support internet video calls. Straight from contacts.
- Night Photo and Night Video modes. - Night Photo and Night Video modes.
- Video recording resolution support. - Video recording resolution support.
- Mail widget - Mail widget
- Official support of portrait mode in web browser. - Official support of portrait mode in web browser.
- Native Geolocations support for web browser. - Native Geolocations support for web browser.
- Volume button can be set to either volume or zoom for browser. - Volume button can be set to either volume or zoom for browser.
- Themes for Smileys and Conversations. - Themes for Smileys and Conversations.
- MfE support enhancements. (Can accept/decline meeting requests) - MfE support enhancements. (Can accept / decline meeting requests)
- SMS option only shows for mobile phone numbers. (not for landlines) - SMS option only shows for mobile phone numbers. (Not for landlines)
- File Manager allows sharing of any files. (no more need for Petrovich) - File Manager allows sharing of any files. (No more need for Petrovich)
- Clear device data and restore settings option. (possibly full factory default) - Clear device data and restore settings option. (Possibly full factory default)
- Group chat possible in Instant Messaging - Group chat possible in Instant Messaging
- Search by typing for applications in App Launcher. - Search by typing for applications in App Launcher.
- Sticky tags for videos and photos. - Sticky tags for videos and photos.
- Away status for status of Contacts (page 52) - Away status for status of Contacts (page 52)
- Can disable Show Captured Video after finishing recording. (page 82) - Can disable Show Captured Video after finishing recording. (Page 82)
- Media player now supports MAFW Plug-ins. (page 91) - Media player now supports MAFW Plug-ins. (Page 91)

sorry i know that alot to look though

As far as I remember, Nokia 5800's initial CPU clock speed is around 369mhz, then after a firmware update, it became 434mhz. (Not sure exactly about the figures)

your correect the cpu was underclocked then set to 434mhz if i remember rightly too :-)

The N900 uses the OMAP3430, which runs at 600 mHz; it is not underclocked and Nokia will not overclock it.

That's true, but 434mhz was the norm for ARM11 and all Nokia TS S60 phones are using it now.
All the manufacturers who use the same chipset as Nokia(Omnia HD, Palm Pre, Droid etc) are running it at 600mhz or 550mhz because those are the numbers given by TI.

what about OS2008 & N800?

(yes I know n810 has same cpu and n800 was underclocked when launched if i remember correctly)

so no way overclocking above 600mhz because 600mhz is already overclocking by 2 steps.