as far as i know:

1. if your visa is still valid until now or til nov 29, 09 (meaning the sponsor will not cancel it anytime before nov9, u can still come back to qatar, with or wothout thier knowledge.

2. you can come back to qatar in visit or business visa after nov 9.

However:

> if you comeback b4 nov 9, under the same sponsor, & you get a job and they are wiling to sponsor you, you must secure from that previous sponsor/employer an NOC to transfer to your new company.