What does the Order do ?

[Doriane]

No: HPFGUIDX 74159


It sounds like a stupid question, I know, but what exactly do the 
members of the Order do ? We know they are guarding the door into the 
DoM (though I can't figure out why if the DE can just Apparate in 
it), and that Snape is on some kind of secret mission probably 
regarding LV (though I can't figure out how LV would not just kill 
him as he said in GoF he would, especially after Kreacher went to the 
Malfoys and spilled the beans). But what else ? What does Lupin do ? 
I guess the Aurors and Arthur have Ministry work to do during the 
day, but what do Lupin, Mundungus, Sirius do ? And even DD for that 
matter : what does he do for the Order ?

Del