D.D.D. wrote: HDD loading, haven't done it but the potential setting tweaking and some incompatibilities have made me wait to try it, and a mod chip, well, for me, has been fantastic. All my games work, JP and US originals & back-ups. But if the HDD loading was sweet & simple like on the Wii or Xbox, I'd try that out ASAP.
PS2 HDD loading has come a long way since it was first realized. It's newest incarnation is Open PS2 Loader (or OPL for short). As far as I can tell, there are no compatibility modes anymore (you don't have to tweak settings for games). Many more games are supported. Pretty much every game I through at it works. And there's a lot of new features as well (I think you can even add covers to preview for each game, but I haven't tried that yet).
Booting games from a HDD has a few advantages that I think are worth a LOT. One, the PS2 can load faster from the HDD, so most games will have improved loading times. Two, since you're loading from the HDD, you're keeping wear and tear off the optical drive. And the optical drive is probably the weakest link in the PS2 chain. Those are the reasons I use HDD loading, with reason #2 being most of it.
It's worth noting that you can actually boot games from a HDD with a PS2 slim, but the compatibility is poor last time I checked. You can use a USB hard drive, which has poor speeds compared to the PATA connection. I think the compatibility was growing because there was a lot of interest in it (you can even buy a custom case for a PS2 slim that stores a HDD inside). In addition to USB HDD loading, IIRC there was even a way to boot games over a network via the NIC. I think the speeds were a little better than USB, so the compatibility was a little better. Also, you can store game images on a hard drive on your computer. So that might be easier than needing an additional hard drive and figuring out a way to load images onto it. I don't know much about these two methods, mainly because I never used them and don't plan to, but I thought it'd be worth mentioning.
D.D.D., if you have a fat PS2, I would highly suggest giving HDD loading a try. You're gonna want Free MC boot installed on a memory card. But if your PS2 is chipped, I think that should be an easy thing to do yourself.