Yes you are able to continue playing if you sit through the credits. You end up going into another Story line completely. I cannot remember at this time if there are any side quests.
If you dont skip the credits you can do quests.
Once once you have finished the game you can do no more quest, all current quests that you had not completed will no longer be avaliabe.
In the regular x-box fable 1 from what iv'e seen you cant but you can in fable 2
No........you cant
you cant
you cant
you cant
you cant
you cant
no u cant
You cant
you cant