I first saw her on Buffy the Vampire Slayer as one of the potentials (if you don't know what that means, you didn't watch the show to the end and that's okay, just keep reading) and didn't really think anything of it. Sure, she was a cute actress - kind of mousy but strong in her own way - but there are a whole bunch of those in Hollywood.
The next time that I saw Felicia Day was on The Guild - a web-sitcom about a guild of MMO players and how they relate to each other in-game and in real-life. For those who haven't seen the series - and if you haven't, why not? - real-life is the hard part. Little surprise! Not only is she the creator, writer, and co-producer, but she also stars in the show. This is where I really took notice of her. If you've seen even a single episode, much less a full season, you'll see that there is a LOT of talent there. Some of my heartiest laughs have come from watching The Guild.
And then, if I wasn't already enraptured by her talent, I later found out that she is a really big geek in real-life. She loves all things geek, is an actual gamer of many genres, and helps make geeks cool. If you spot any of her videos going through one of the gamer/geek/tech conventions, they're definitely worth the watch.
She's also made the rounds to all forms of geek-style media. She's voiced and made live-action shorts for games like Dragon Age 2 and Guild Wars 2. She's been on shows like Dollhouse, Eureka, and Supernatural.
THEN she takes it to the next level and creates the Geek & Sundry channel on YouTube, producing a whole plethora of awesome shows. That my most favorite geek in the entire multiverse, Wil Wheaton (who was also on The Guild), is involved in G&S is just icing on the cake.
So here's to you, Felicia (I can only assume that she'd let me call her Felicia) - have the best birthday ever and I wish you many, many more. Please keep creating and showing the world that geeks are cool! I know that you are!