As promissed, last weekend I did a quick hack on xournal code and ported it to Maemo platform. I've been somewhat busy lately and I have found some time to build the package for 770 only yesterday.
Xournal is a great application, it fits perfectly on 770, but unfortunately its performance on the device is far from acceptable. Iván Frade has sent some emails to the author, Denis Auroux, and since yesterday the project is hosted by sourceforge. From now on we can help developping and improving xournal. If you want to help, don't hesitate to join the project.
Some screenshots taken from the 770:
The package ready to install using the application installer and it is available here. Don't forget to install libgnomeprintui dependency. Have fun!