I was going to suggest a similar thing to Starbright - can you start people doing their new tasks now before you go and take a huge step back being there to give advice/support but not actually doing the tasks thus granting them ownership of their new responsibilities sooner rather than later. In this way you have the confidence when you leave that thiings will run ok?? People tend not to do things if they think someone else will tidy it all back up in a week or twos time but if they know from now on it is their responsibility and take the opportunity to learn now while there is someone there to advise them on how to clean up their own mess.

Sorry I'm very tired today Rufalina but I hope you get my drift