Death from above, or fun things to do with a flying mount
I got my flying mount at four in the morning, and I spent most of my WoW time the next day in instances, so I had to wait for last night to really have fun with it. I was tired of getting buzzed by Alliance and the jerks in my guild that got their epic flying mount immediately (see above picture). After doing a quick flight over Skettis and leveling my lockpicking to 350, I checked out some other interesting things you can do with a flying mount:
Go to Hellfire Peninsula and buzz the lower-level opposite faction by dive-bombing them from the sky, just to see them run away in fear. Bonus points for hovering directly over their head for five minutes.
Pick up two guildies and fly in formation like geese or fighter pilots. See how many random people join you.
Get a large raid to try to spell out words in the sky. I couldn't convince my guildmates to do this, but imagine what a much-disliked person from your faction will feel when you whisper him to "look up" and he sees your entire guild, on windriders, spelling out "DIE" ...
Claim one of the small, random, floating islands as your home. I chose a little place with a tree high above Garadar, for convenient city and river access. If you're feeling obnoxious, begin trying to sell real estate in general chat.
Look in odd places for herbalism and mining nodes. One herb, mana thistle, grows only in places you can reach by flying mount. Plus, it'll be a lot faster to find that Khorium you've been looking for if you can just drop down and grab it.
See how high you can survive a drop into one of the lakes in Nagrand.
Play chicken around the opposing faction's cities, since they now have flying guards. I did this and ended up on a mountaintop with around 23 health. Oops.
What fun things have you found to do with your flying mount? What are you looking forward to doing?