ok, so...i know im late in my theories and such, but i recently found the novels on the site, and couldnt leave this sitting alone (also...new season starts in less than a month!!!) im too lazy to quote people, so ill just respond to things in one spoiler tag.
Spoiler: (hover to reveal the text)
Nathan will die, but i don't think he died from the incident that happened...my belief is that Sylar kills him later on down the line, and then assumes his identity shortly thereafter. Sylar is also not dead or ending his killing spree any time soon, because we saw him with even MORE abilities in the future than what he already has at the end of this season. shapeshifting? maybe that's the connection to the bug, because he'll take the form of the bug to get around without people noticing him until it's too late? idk...but Sylar's original power is to know exactly how things work and the mechanics of almost everyone and everything he meets (the clocks?). His ability allows him to find exactly what it is that gives each character their powers, and then begins the process of taking that part and embedding it into himself.
Peter is still alive, because he gained semi-control over Claire's regenerating ability. but that wouldn't matter, if my theory is correct; that once he was freed from the powers that were surrounding and pouring into him, he was able to gain more control. I think the reason he didn't fly away was that he was trying to control the mass amount of powers he was absorbing when everyone started appearing. not only did he have the powers of most of the people already inside of him, but there were also some new ones that he had previously been unexposed to (Micah, and all of the powers Sylar had absorbed prior to the incident, for example). Trying to supress all of the powers within him was probably taking a toll on his strength, and simply getting them under control prevented him from channeling any one power to fly off. The reason I believe he hasn't shown signs of everyone's TRUE power (doing everything in the extent and magnitude that they can) is because he hasnt mastered them. he's only just learning how to control his own power, so exploring what he can do with the powers he's absorbed has been out of the question so far.
Mr. Deveaux's power, i agree, is probably something to do with dreamwalking. Everything that drivebyinsult wrote i strongly agree with, and I don't have any doubts that his power is something along the lines of dreamwalking.
the Haitian and many others (including Matt) are definitely proof that the injections they were all made to take put a damper on their powers. Now that their injections are beginning to wear off, their powers are growing significantly.
I really wonder what the story is with Hiro and his father...My theory is that Mr. Nakamura is kensai, like i think it was D4rk said. I also believe he has the power of either 1. rebirth, or 2. eternal youth, or 3. control over his age... Present Hiro goes into the past, as we've seen, and helps him in some way. He also probably tells kensai that he's from the future, blah blah...and that he's his son. and so now kensai has been spending years and years trying to find the right Hiro (notice Hiro's grandfather also has the same name). Since the episodes have been taken offline, i cant find it, and i could be wrong, but didn't he say something about finally finding him? he knew that in order to save either the past or the present, he needed to train Hiro in the art of sword fighting and everything he could.
September 24th for the US...woo! and S1 is now officially on DVD.
also, with the novel...has anybody found the secrets to them?
EDIT: found information on what's in the box set for $48 (it's seven disks, and the last one seems to be all special features and awesomeness):
Disc 1
Run Time: 1 Hours and 37 Minutes
MPAA Rating: Not Rated
Audio: Dolby Digital 5.1 (English)
Subtitles: English SDH, French, Spanish
Picture: Anamorphic Widescreen (1.78:1)
Color
Bonus:
Unaired Pilot: The Tim Kring Cut With Audio Commentary By Show Creator Tim Kring
Deleted Scenes
Disc 2
Run Time: 2 Hours and 54 Minutes
MPAA Rating: Not Rated
Subtitles: English SDH, French, Spanish
Color
Bonus:
Deleted Scenes
Disc 3
Run Time: 2 Hours and 54 Minutes
MPAA Rating: Not Rated
Subtitles: English SDH, French, Spanish
Color
Bonus:
Deleted Scenes
Disc 4
Run Time: 2 Hours and 54 Minutes
MPAA Rating: Not Rated
Subtitles: English SDH, French, Spanish
Color
Bonus:
Deleted Scenes
Audio Commentaries with Cast & Crew
Disc 5
Run Time: 2 Hours and 54 Minutes
MPAA Rating: Not Rated
Subtitles: English SDH, French, Spanish
Color
Bonus:
Deleted Scenes
Audio Commentaries with Cast & Crew
Minder Reader
Disc 6
Run Time: 2 Hours and 54 Minutes
MPAA Rating: Not Rated
Subtitles: English SDH, French, Spanish
Color
Bonus:
Deleted Scenes
Audio Commentaries with Cast & Crew
Disc 7
MPAA Rating: Not Rated
Subtitles: English SDH, French, Spanish
Color
Bonus:
Audio Commentary - How to Stop an Exploding Man with Tim Kring, Dennis Hammer and Allan Arkush
Making of
Special Effects
The Stunts
Profile of Artist Tim Sale
The Score
i'm curious as to what the Mind Reader is...and I can't wait to see Tim Sale's profile...and the score...