
Thinking of creating an app or widget for the Nokia N900? The official Maemo 5 User Interface docs are now at forum.nokia.com detailing usability principles, device orientation, controls, icons, dialogs, etc. There is also a GUI design interface template in PSD format, so User Interface / Experience designers out there can start mocking up apps.
The docs are in three parts:
Additional documentation is also at the maemo.org wiki.

Thanks for blogging about this.
However, as the talk page says:
http://talk.maemo.org/showthread.php?t=31832
The official docs are at forum.nokia.com, specifically:
Hildon 2.2 UI Style Guide
Hildon 2.2 Widget UI Specification
Fremantle Master Layout Guide
And PSD, not PDF
Was rushing to write this, this morning since I was already late for work. It’s now fixed. Sorry.
Thanks.
[...] a documentação do HIG do Maemo 5 (aqui! aqui!), o que é bom para aplicações que estão sendo ‘Fremantle-izadas’, como [...]