The main RPGds site is temporarily down, it will be put back up once I have time to work in it, which will be after the upcomming r12 release.

I did, however, put the forums up, as well as the downloads for r11, the links are as follows:

Official RPGds Forums
http://www.rpgds.com/forum/

Download for Linux:
http://rpgds.elbenshira.com/rpgds-linux-r11.run

Download for Windows:
http://rpgds.elbenshira.com/RPGds_WINDOWS_r11.zip

Lessons Project:
http://rpgds.elbenshira.com/RPGds_lessons_project.tar.gz

Resource Examples:
http://rpgds.elbenshira.com/Resource_Examples.tar.gz