Like Krysalyss, we chose the day after Kyson's 2nd birthday as well (ON his actual birthday seemed a bit mean, hehe). Kyson was only using it at night time and nap time, so a week or so before his birthday when he was going to bed, I would tell him that soon he was going to turn two and be a big boy. And when he is two and a big boy he won't need his dummy any more. Then closer to his birthday I would tell him how many more days (not sure if he really understood though), and then on his birthday I told him that he was a big boy now so he could have his dummy one more time and then he wouldn't need it anymore. The next day I put the dummy away without him seeing. He didn't have a nap that day so he was really tired come bedtime, and when I put him to bed he didn't even look for the dummy. He just cuddled up with me and fell asleep. He's never looked for it since! I expected drama and was so surprised at how smooth it went.

I've also heard of ideas like Santosha mentioned where the "dummy fairy" comes to collect all the dummies. Maybe tell him about it for a week or so, and connect the final day with something that he remembers. Maybe a Saturday when you can tell him something like "On Saturday when Mummy and Daddy are both home with you" so he can sort of know when it is coming.

I think the biggest thing that helped for Kyson was that I didn't mention it at all on the first night I put him to bed without it. Rather than tell him that he was going to go to bed without his dummy, I just said nothing about it and put him to bed with the normal routine minus the dummy. I think if I had mentioned it he would have wanted it.