As promised, for those of you participating in the Midsummer 2010 exchange, the Dear Santa post! Writing a letter to your Santa is entirely optional, but if you choose to do so, please leave a comment on this post with a link to your letter (posted in your own journal).
A Dear Santa letter is simply an expansion of your sign-up requests. It's a letter you write to the person who recieved you as their assignment, one where you can expand upon the requests you made, or maybe add in important things you forgot to mention (the fact that you really love zombie tentacle sex, your irrational fear of marshmallows, etc).
Let them know if there are things you absolutely do not like, but also let them know what will make you go clappy-hands with glee. Letters can be as long, short, detailed or vague as you like them to be, but try not to make things too hard on your Santa. Their biggest stress is going to be trying to make you happy, so try to give them a solid idea of what you like while still giving them room to be creative.
If you have any questions about writing a Dear Santa letter, feel free to either poke around the comments section and see how other people are doing it, or e-mail Aka, Sionn or myself - we'll be glad to help you out!