I'll second Tarrant. The guy's a genius.
Thirded.
Fourthed.
Tarrant arrived early on the scene with grand designs, just like many others, but has really stood out from the crowd in that he's stuck with his initial plan and done some really great work.
Weijeisen (http://www.fallout3nexus.com/downloads/file.php?id=8340), and HugePinball (http://www.fookunity.com, http://www.fallout3nexus.com/downloads/file.php?id=11532).
Having worked with both
Weijiesen and
HugePinball, I agree completely. They've both just returned to the modding community to some degree after relatively long absences.
HugePinball's new http://www.fallout3nexus.com/downloads/file.php?id=11532 mod is very professional. It's also the current leader of Fallout 3 Nexus' "http://www.fallout3nexus.com/downloads/filesofthemonth.php" competition.
Cipscis