Even though I'm only going to list devs who are exclusive this gen, it's mostly because of works they did on the PS1 and PS2 - mainly because this gen's not over, and a lot of the real gems aren't out, yet.
1 - Naughty Dog. Crash Bandicoot is the reason why I got into gaming, after I went around a friend's and he was playing Crash 2. I got a PS1 that Christmas along with Crash Bandicoot, Rayman, Track and Field (mainly for my dad, looking with hindsight), Street Fighter (forget which one - something like EX+ Alpha, or something), and Micro Machines v3. Needless to say, Crash was my top played game, and me and my dad went on to complete the first three games together, within relatively quick succession.
I got my PS2 a few Christmases later along with Dead or Alive 2, Crash: WoC and Jak and Daxter. I loved Jak and Daxter so much, and the sequels moreso. My dad didn't really join in with the gaming that gen, really only playing the occasional Fifa match, or something like that.
I bought my PS3 on launch, eagerly awaiting the launch of Uncharted - and it did not disappoint! My dad also got back into it, and he's completed the game a couple of times over (though, saying that, it can be painstaking watching him make the same mistakes over and over - but he seemed to have a hell of a load of patience). I'm really looking forward to Uncharted 2 - and I'm hoping my dad will actually pay for it - seeing as he will play the game himself so much - but the odds on that happening are slim to none. 
2 - Insomniac. Although I never found their games to be as great as Naughty Dog's, Spyro and Ratchet were still great franchises. Resistance 1 was a good effort on the old FPS front, and Resistance 2 built up quite well on a solid franchise (though, I'm sure many would disagree with me on that). Insomniac also score points for the sheer rate at which they pump out such high quality titles (what is it... 3 Ratchets and 2 Resistances in 3/4 years (I actually can't work out the years - but my brain is fucked - I had a party last night, didn't get to bed until 11am, and only slept for a few hours before I had to get up).
3 - Sucker Punch. Although I don't own inFamous yet, I did enjoy the demo and have spent some time playing the game around a friends, and this has been enough to warrant a purchase in the coming months. But, Sucker Punch are mainly on here for their fantastic Sly series. The gameplay was some of the best I had seen, and I absolutely loved the art style and character design, it's a shame these games didn't get the same kind of recognition as Jak and Ratchet, but, I still loved them.
4 - SCEE London. These guys have been Sony's biggest breach into the casual market. Most of the EyeToy stuff as created by them, and they're also responsible for the Singstar series. Eyepet looks very interesting, and if it turns out good, it will be what causes me to make the purchase of a Playstation Eye.
5 - Media Molecule. This was actually quite a hard one for me, mainly because a lot of my favourite games/developers aren't exclusive, and so I searching for reasons. However, LittleBigPlanet was quite a good game, and seems to be a roaring success for Sony. That, and they got Stephen Fry to do the voice work, and that's just epic.







