Ever since Daylight Saving Time went into effect, there's been some interesting glitches on the way dailies function for my server (and I assume most others as well). Specifically, the quest for the day is updated at 3AM server time as always, but the daily quests themselves reset at 4AM server time.
How is this useful you ask? Here's an example that I just did tonight. Sunday's cooking daily was Convention at the Legerdemain. As I didn't have any chilled meat at the time, I skipped it and checked back with the NPC a little after 3. The daily was now Mustard Dogs!, which gives 2 awards instead of the normal 1. I grabbed some rhino meat out of the bank and completed the quest. An hour later at 4, the "you can only complete 25 more daily quests today" message comes up, and lo and behold I pick up Mustard Dogs! again, complete it again, and get another 2 cooking awards.
Granted, this isn't useful for all of the daily quests, but for the ones that rotate (dungeons, fishing, cooking), it may well prove useful.