ive tried every guide there is. im trying to stream from a mac thats connected wirelessly to a DSL router...cant stream to my PS3, cant connect to things outside the network (using apple apps to stream video or music over the internet9 and cannot get connectable for torrents. very frustrating.

can anyone offer any tips that may be eluding me?

Can you check the router to see if UPnP (Universal Plug and Play) is enabled? Most apps today can negotiate port numbers themselves. It could also be a software firewall on the Mac, but I don't know shit about Macs.

but there shouldnt be a problem based on the fact that im not directly connected to the router (i.e. its hooked to my wifes pc)?

no, it should work the same, whether wireless or not.

The router isn't directly hooked to your modem?

its hooked to the modem and then is hooked through cable to the wifes PC and wirelessly to my imac

I ran into a problem with my wireless computer can't talk to my cabled pc because they do not have the same "Network name". My wireless computer is on a different network. To fix this, I would have to change the router settings. It was easier for me to buy a wireless usb network card. (I can't get into my router because when I was resetting the password, the thing locked up on me and now the password doesn't work, and neither does the blank admin. I now have to reset the router and that isn't worth my trouble.)