I've been using the Gamestop 3-in-1 cable; you can hook it up to (I believe*) any of the current-gen consoles (but only one at a time, otherwise sound gets messed up). Not as cheap, but if you have the other systems and aren't running them component or HDMI already worth the extra if you ask me.
* I believe = haven't tried a PS3, but I know it works on PS2 and pretty sure PS3 has the same component out slot. At least I think when I've looked at PS3 cables they've mentioned PS2 compatible.








