Yeah ive got the wireless set up and it sucessfully logs in, i click on downloadable content and theres nothing there ): i though they had released some DLC so looked at it again and there was nothing.Wow the NCR are a touchy bunch arnt they

The only DLC PS3 has is the preorder things you might have gotten.
there won't be any dlc releasd for te ps3 for some time, as the 360 has an exclusive time-based agreement with bethh/obsidian (meaning they get it first until whatever time limit they have is over, then the ps3 and pc gets it). the new patch still hasn't come out yet and when it does, if you're connected to the internet, it will automatically download when you start the game up. watch the forums and you'll know when a new patch comes out.
At this point I think that the "Timed Exclusivity" deal with M$ is actually all about ensuring people will buy on the system. FO3 sold exponentially better on the PS3 and PC if I remember correctly. I would believe, without bias, that the original deal was due to Bethesda thinking that the PS3 was not going to survive and so they didn't wish to waste time on a non-selling system. After the world realized that the PS3 not only was going to survive but slowly grow to dominance they released the DLCs on PSN. Now I believe that they know that the 360 is a...lets say, less than premium revenue force, and wish to ensure that they sell SOMETHING to the users of that platform.