edit: thread cleaned of childish trolls from ps2hd.
Although in japanese and quite buggy memCPP allows you to use ps2link or execftps to transfer save games to and from your ps2 Using a specialized frontend for ps2client. You can get more info and the download at the authors page. We will also have translated docs and a translation of the app shortly.
memccpp has been updated to 0.09 beta2. Download it at the same url above. Thanks to Elseno for the update news.