For K, we are concentrating on the 3R's, the Bible and science. We are doing K right now even though our official K year begins in the fall.
Here's what we are doing now:
Bible - reading through a devotional
Math- Horizons K
Science - Sonlight K
Reading/LA - dd works on starfall.com, readingeggs.com, we read aloud and she reads to me. She uses BOB books and whatever else is at about a K level in reading.
Writing - she just took an interest so I bought some books from the Dollar Tree to trace and write in - nothing formal yet.
Here is what we are doing when we start "official" K:
Bible - either CLE Bible 1 or Lifepac Bible 1 (from Alpha Omega)
Math - Singapore math 1 with either A beka 1 or Horizons 1 as supplement
Science - continue with Sonlight Science K
Reading/Phonics - not sure the exact plan yet. But I do have Horizons Phonics K. I am also going to introduce her to Progressive Phonics - it's free.
Writing - not sure yet, I want to see how well she progresses between now and then.
Those are the more "formal" things. We will also include crafts, music, PE, real life stuff, etc.
For K, I have state standards to think about and I asked my big girl what she wants to learn about the most (her response: "math, science and arts" - arts meaning craft projects!)
ETA: I will never buy a grade level curriculum again. Usually kiddos are all over the map in skills that it's hard to keep them to "one grade level" in everything. At least that's the case in our home.