Ok, had quite a problem if I should post this here, or in guides, anyway, I've choosen exploits, since i dont think Blizzard tought about getting quest items for SOME dailies for 2 or more days.
Basically what we gonna do - if u have some free time in day #1, and You know that You got some important things to do the next day, You can actually get some rep / cash that day, in umm.. 5min, just turning the items you got in day #1.
Of course.. you cant do that with all the dailies... so, lets get to the point of this post!
Daily quests@ Netherwing Ledge, that allow You to get q items needed for next day.
1.Netherwing Crystals: you need 30 crystals per day, which makes 60 if You need them for day #2. They basically drop of ANY mobs at netherwing ledge, mostly of the flayers inside the mine, and they DO drop even, if ur not on the quest at the time, making it simply farmable all the time.
2. Nethercite Ore / Netherdust Pollen / Netherflayer Hide (not sure if that skin / herb name is correct, anyway u know what i mean^^): you need 40 of each, and u can only have 1 of these quests, depends on your proffesion (mining/herb/skinning), ore's come from veins, herbs from bushes, and skins are skinned from flayers - everything on netherwing ledge. You can get as much as u want, even if ur not on the quest, on my paladin i still have like 5-6 stacks left, and im exalted + you can buy them of AH , or sell them.
3."A slow death", this one is rather tricky, you need to poison peons camp, and u need 12 fel glands dropped by boars/diamedetrons/chimaeras in SMV, once u have 12, u cant get any more... but.... here's the trick, once you will poison 11 camps, go back, and....the fel glands will drop again, u can get 11 of them, so only 1 will left for the next day.
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Isle of Quel'Danas
Here are only 2 quests that i know that could be done this way.
1. Disrupt the Greengill Coast - you need to farm like 3 of these items to free 10 murlocs, so, basically , get 6 of them ,they do not disappear when u finish quest, so u can use them at next day.
2. Arm the Wards - you do this like that: get 4 mana remnants (they're unique) , energize the ward, but DO NOT turn in the quest, then get 4 drops again, turn in the quest.
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There could be more quests that could be done like that, if u know any - feel free to post. Also if this is repost - link plz.