ive tried going to manage your accounts on the achievements tab but all it allows me to add is 360,steam and WOW : (

You cant.

It's not possible. Sony don't want to share the account information.
Stupid, I know.

Doesn't work, Sony won't allow the stuff out to sites like GB so they took the service down, but left accounts that had already been synced in their system incase it became available again. So you can't, maybe down the line.

really why is that ? 
 
i read a post on the subject dated october 5th 2009 where jeff announced ps3 trphy support for the site
 
 http://www.giantbomb.com/news/giant-bomb-now-with-full-playstation-network-trophy-support/1718/

Yeah but later in the month he announced that they had to take it down, it was part of an achievement update, so read those from around the same time and you'll find it.

wow that really sucks!!!!!!!!!!!!!!!!!!!!!!!!!!!!! i barely play my PS3 as it is but since my 360 bit the dust and is in repairs i decided to go for a double S rank on battlefield 1943 and i achieved it and then some actually have a bigger score on the ps3 than the 360 now lol shame i wont be able to show it off on here : ( 
 
oh well , jeez the japs really dont get the internet at all do they

" really why is that ?   i read a post on the subject dated october 5th 2009 where jeff announced ps3 trphy support for the site   http://www.giantbomb.com/news/giant-bomb-now-with-full-playstation-network-trophy-support/1718/ "