The only way I’ve heard of linking my PSN account to my Steam account is by purchasing a NEW copy of Portal 2 for the PS3. Linking your PSN account will NOT give your Steam games. All linking your account does is permit you to sync your steam achievements for Portal 2 with your PSN trophies, access Steam Cloud for saves, and access your close friends list whilst playing Portal 2 on PS3. You can not hyperlink PSN and Steam with no Portal 2. It’s the only gave with Steam Help on the PS3.
I have a Playstation three Network account and a Steam account. Steam achievements are earned in lockstep with PSN Code Generator earning a PSN Trophy while logged in to a Steam account will award you the corresponding Steam Achievement after you have linked your PSN and Steam accounts. If you pick to generate a new Steam account, the name of the account will appear to other folks in Steam to be the very same as your PSN ID.