As of 16/09/2011, I started to use the Redmine(http://www.redmine.org) to our internal development project.
I will describe tips, setting, useful usecases in this page.
[ TIPS / SETTINGS ]
1. Can't upload files to the project.
Basically, this is related to file permission.
In fact, we should the create the /va/lib/redmine/default/files directory which will store all the uploaded files.
And change the UID and GID to the redmine, the user/group name for Redmine.
sudo chown redmine:redmine /var/lib/redmine/default/files
sudo chmod 775 /var/lib/redmine/default/files
ls -l /var/lib/redmine/default/
total 4
drwxrwxr-x 2 redmine redmine 4096 2011-09-27 15:57 files/