The PS2 will need a GS2(Gameshark 2). EBWorld has the GS2 coming out on 1-11-01.
The GS2 will support PSX games on the PS2. But... It is in CDX format. No hacking like with the GSPro. You may be able to use a PC to hack, but that\'s not too likely.
Another device is the CodeBreaker by Pelican Accesories. EBWorld has this one coming out in March.
According to the Pelican website, it can:
1. Use Gameshark codes.
2. Allow you to "create" your own codes.
This may be the one to wait for, but Pelican is being super tight lipped on any info.