DBO acts as a better continuation to the story. I believe Toriyama had a hand in it, too, which would make it more canonical than GT's events.
Basically :
-Goku and Vegeta, knowing they were nearing the end of their lifetimes, took off in spaceships to some unknown planets a long way away from where they would harm anyone, for a final fight to decide who would be the victor. Several decades later, several super novas were recorded in the direction Goku and Vegeta took off toward. No one knows what exactly was the result.
-Gohan wrote a book on all kinds of martial arts and Ki control, called "The Science of Ki Control." It contained information on all of the techniques all of the Z Fighters ever used.
-Dende seals the Dragon Balls so that no evil can obtain them, under the influence of the Supreme Kai(s), as they're not of the natural order of things.
-Majin Buu creates a female Buu out of his own essence and has children with it.
-Hercule resigns from the World Martial Arts tournaments because he could no longer rig them, due to Buu giving it up for his new family. He eventually dies of unknown causes
-The remaining grunts of Frieza's army decide to raid Earth in hopes for revenge. They're all defeated by the remaining Z Fighters. Because of their stepping up to save the world again, their abilities become public spotlight and everyone wants in on their abilities.
-Krillin becomes the new Turtle Hermit and creates a Turtle Hermit school, where he teaches Ki-based martial arts.
-Tien creates a counter school; the school of the Crane Hermit. He teaches Ki-based martial arts used for exposing an opponent's weakness.
-Trunks and Goten create a school for aspiring swordsmen, teaching Ki-based techniques using the sword.
-Miira and Towa, two new Artificial Beings/Androids, destroy the new planet Namek; all surviving Namekians flee to Earth and decide to live there indefinitely.
Blah, blah, blah. Eventually, it turns into a pissing contest between those living on Earth and Miira, Towa and their grunts across time and space. Oh, and Trunks is time traveling, trying to keep history in check.
There's a LOT more about it here, with proper dates and time frames for things :
http://www.kanzenshuu.com/forum/viewtopi...=8&t=19499