The most excited I've ever been was when I obtained my Albino Drake. It was before WotLK even hitted the live servers, the day after achievments were introduced into the game. I knew the achievment was in so I started working on it and I hitted exalted with Kurenai the day after the patch, bought the talbuks and wham, there was that awesome first drake I ever owned. Awesome to just sit in Shattrath and have people commenting and liking your drake ^^.
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First time I saw a feldrake I just had to have it. Also it will help me reach my goal of 100 mounts.
Visiting old content that has naturally been left behind, content which I never had time to commit to while it was the new content.
I'm still trying to get the Stratholme mount.. after all these years... will be super-excited if it ever drops for me lol
Finally getting Val'anyr
Downing heroic Deathwing... after Cata was over. lol
I would have to say assembling Val'anyr. It was my first legendary, and I was honored that my guild chose me as its first recipient.
Favourite accomplishment? Getting an Onyx Cloud Serpent weeks before my guildmates. ;^D
Back in classic wow, I got the benediction and it was the happiest moment of my time playing it felt like such an amazing feat I had to tell everyone! :D For Cataclysm it had to be the Camel-Hoarder title I was soo proud once again I told EVERYONE even strangers xD
A rest after 46 hours of farming Blood-Soaked Invitation
Getting all the mats and farming everything for Sulfuras and Thunderfurry with my favorite person to play wow with who also happens to be my love.