You know, because Google is so hard to use. Apparently, you need to spell things correctly to find information on them! Appalling, really.
Although now my "need to get around to buying" list has grown thanks to these people:
http://www.boysonboysonfilm.com/news/essential.html
While flipping through the site I came across this little snippet:
To bad this is nearly impossible to find legally.Ryokohunohara Labyrinth contains none of the gut-wrenching angst that shounen-ai often centers on, nor does it depict even so much as a kiss between the main characters. Instead, tender imagery and meaningful flashbacks focus the 40-minute OAV on the closeness and devotion of the two boys.
