Isaac and Deanna did start dating not long after his breakup with Karina. They dated for two years before they broke up. Deanna later married a few years later, but divorced six months after. She and Isaac have since gotten back together, and finally married.
Libby did finally get to meet Jason Behr. Apparently he had seen the show and thought she was cute. Although nothing romantic came of that, the two have become fairly good friends. Libby now works as a movie make up artist.
Zac and Jasmine actually became good friends. Until one day they both ended up drunk and slept with each other. The two were so disturbed by the incident that they broke contact, for a few years. They did meet up again at Isaac and Deanna's wedding, and no, Jasmine had not had his child (you were sure that was gonna happen huh?). At the reception they decided to give dating a go, and have been ever since.
Taylor has been dating his current girlfriend for an amazing four weeks. Without either one of them cheating on the other like what usually happens. Who knows, maybe something will come of this one after all.
THE END