Here’s a habit I’ve got myself into, and I find it saves me a fair amount of time in alt-tabbing-for-wowhead-searches.

I keep a spiral-bound notebook by my computer.

• The front has information that I need often enough to want it written down, but things I don’t remember off the top of my head: mats for enchants I get over and over again (eg +81 heal to weapon, which I need every time I get a weapon upgrade), or potion mats (so I don’t have to look up WoWhead when I’m on my non-alchemist herb banker, sending mats through for the week’s elixirs).
• The middle has information that I’ll need soon, but not permanently – the shopping list for mats for a storage bag, perhaps, or a list of questgivers who had silver !s when I passed them, to remind me to recheck them for quests next time my alt levels up.
• The back just gets used as scratch paper for adhoc notes that can be torn out and thrown away as soon as they’re done.

It’s a lot better than having a random stack of scraps of paper, and I find I reuse information more effectively – if one of the pages still has the heal assignments from last week’s boss kill scribbled down, I can reuse those assignments this week instead of trying to work them out again from scratch.

If you’ve got any useful little life hacks that apply to your WoW life, feel free to share them. I’m always interested in being more efficient. :)