I think it could be a good idea when everybody post his/her favorite episode of each Star Trek series. So the dev from STO can see what kind of Star Trek the people from this forum like. Maybe they can integrate some parts in STO.
TOS: Mirror, Mirror (2.04) - Kirk meet the bad Federation from the mirror Universe
TNG: Tapestry (6.15) - Q give Picard a second life
DS9: Little Green Man (4.07) - Quark, Nog and Rom are the Roswell Aliens
VOY: One Small Step (6.8) - VOY discover the relicts of the first human Mars mission
ENT: Dear Doctor (1.13) - Morality and philosophy in ENT (actually a typical TNG episode)