For me the first one that sticks out is Jake the Snake's heel promo after slapping Miss Elizabeth and DDTing Macho Man 2,000 000 times. He comes off as a real psycho and is utterly convincing, you can't ask for more in a promo IMO. You can bet your bottom dollar all of it just came off the top of Jake's head too.
It still surprises me this sort of content was in the WWF around this time (91/92) as it was still firmly entrenched in the lollipop Hogan era.
Batista and Cenas promos this year where epic
''You keep kissing badies and hugging fat girls cause im going to
be in a gym somewhere thinking of the beeating im gonna give you''
''you cant see me you cant see me''
''you want some come get some ''
from Batista and from Cena
I marked when he came out and pretended to be scared
of Batista and than Dave started getting cocky
than Cena Owned him about having Security and
not being able to really stop after all the attacks he tryed
I could probably list a top 10 of Eddy Guerrero promos, but the ones that stick most in my mind are the Smackdown after he dropped Tajiri through the windscreen of his Lowrider, and the fans completely refused to allow the intended heel turn. I always wondered at what point he realised he needed to change the whole tone of that promo.
Also midway through his "papi" feud with Rey, when he sat on a chair in the middle of the ring and gave a really intense "you want to come fight me, I advise against it" speech. I think it was around summerslam time, but I forget since they basically spent the whole year fighting.
Best promos of 08 I can say that much. Last time Edge was truly awesome as well imo. Edge was so into it in that third promo, you could see his vein popping out of his forehead. Apparently because of how intense it was to play that character, is why Edge didn't come back with that psycho character and regressed back to his ultimate opportunist ways when he returned. Shame to because it could have been very interesting for a while to see that side of Edge when he returned in 08. Plus he also had an awesome HIAC with Taker at Summerslam. Edge really put it all out during that 3 week period.