Wasnt this the very reason MS got involved with consoles, the fear that Soony would take the front room with a simple yet powerful machine that accesses the web? The reason they will not add a browser is that it will hurt anouther market of theirs. For your information I use the PS3's browser to watch videos from the net, i.e. youtube, bbc iplayer, iraqgoals (if someone knows of a better site for live football I would love to know) and pornhub.
assumption is the mother of all f**k ups