First Grade Frame of Mind is hosting a Linky Party about welcoming your new students with a letter or note.
I have done postcards and letters in the past... but the last few years I have sent my students a letter. It is copied on cute kid paper, front and back. I mail it out as soon as we get our class lists (about one week before the orientation--when they mail out student letters). So, they should receive 2 letters from school on the same day: 1 to find out their teacher/room number and 1 note from their teacher!
I have found including another copy of the supply list really helps families send in supplies at orientation (instead of the 1st day of school--so I have a chance to organize it and put everything away!!). I also put a few wish list items as well. :o)
Here's the note I sent last year: