Mustrum_Ridcully said:
But since some people do the 3B (Brannon Braga Bashing) - Who is Who in startrek? Who is responsible for what?
I know from Deep Space Nine:
Producers where Rick Berman and Micheal Piller, the former more responsible for script things...
I think this is the same for Voyager and Enterprise, so what is this Brannon Braga guy all about? 
Mustrum Ridcully
Here's a sort of Who's Who list for Star Trek. It's probably not totally comprehensive, but it should cover most of the basics. Some of my fact might be off, I'm dredging most of this from memory. If anyone has anything to add to it or corrections to make, feel free.
Gene Roddenberry: created Star Trek. I trust everyone in this thread knows who he is?
The Original Series
Gene L. Coon: One of the producers during at least the first and second season. He established a lot of basic foundations of the Star Trek universe, including the Kirk-Spock-McCoy relationship, as well as concepts like the PD. I believe he's been dead for years.
D.C. Fontana: She edited the scripts or something on TOS and wrote a number of episodes for the series. Many of them were important character episodes like "Journey to Babel". I believe she also worked on some of the development of TNG. She also helped to establish a lot of the basics of Star Trek. She hasn't done anything in Star Trek for quite a while, I believe.
Next Generation
Rick Berman: Started as one of the producers from the early days of TNG. Succeeded Roddenberry as head of the Trek franchise after he died. Involved in the development of every Trek series since TNG.
Deep Space Nine
Michael Pillar: First started as a writer around the third season or so of TNG. He developed DS9 with Berman and Voyager with Berman and Jeri Taylor. Eventually left Star Trek. I'm not sure when , but I think might have been around season 4 or so of DS9
Ira Steven Behr: Also started out during TNG around season 4 or so I think. He developed a lot of the Ferengi culture as seen on DS9, including the Rules of Aquisition. He eventually became co-executive producer of the show with Berman after Pillar left, and I get the impression he was responsible for some of the "cooler" ideas that pooped up in the later episodes of DS9.
Star Trek Voyager
Jeri Taylor: Also started out during TNG, around the same time Behr did I think. She's most well known for developng Voyager.
Brannon Braga: Like all the others executive producers since Berman, he first started out in TNG, but later than the others, I think he wasn't around until the 5th season or so. He became executive producer of Voyager after Pillar and Taylor left. He also developed Enterprise with Berman.