As you know, the Resistance: Fall of Man game updates via PlayStation Network. The resident PS3 Devs (Subdub and Gigi) discovered this nearly 6 months ago and others (Placa, to name just one) soon after, it's just another rehash of the old Warhawk method (detailed here and here), but more constrained.
For example, using the Warhawk hole users could change directories, in the R:FOM one you can't. In layman's terms, it means this R:FOM method is even more limited/useless than the Warhawk one was. Of course to those who just recently discovered it- this is being incorrectly labeled as something useful when it sadly isn't at all.
However, since Sony plugged the Warhawk hole in a past Firmware Update, most of the devs opted to keep quiet until tonight... as now this hole will certainly be addressed in an upcoming Firmware Update as it is indeed a security issue to Sony.
It's a fairly simple method. Using your favorite DNS "hijack" method, or proxy server redirect download-prod.online.scea.com to a HTTP server.
On the HTTP server, set up the path:
So, http://download-prod.online.scea.com/client-<br>patch/resistancegs-prod/resistancegs_SCEE/18.104.22.168/ will be redirected to your HTTP server.
You will want to download the files from there to your HTTP server, and recreate the file directory. You can then begin to play around with the files.