I have been thinking about the advent season and practicing it for a few years but we weren't in a good place last year and it slipped away. This year I'm getting a late start but I'm getting a start, so that is saying something. Some advent sites that I've been looking through, thanks in large part to TulipGirl.
This site has lots of neat stuff but also a world advent calendar.
Teaching Mom has a nice advent history and a advent calendar resource.
Its big scripture ideas but I think the children's bible can make it to the 2 yr. old level. Going to incorporate this into the daily christmas album.