I have to say, if you have kids or grandkids who are anywhere between the age of 0-6, you really ought to consider getting the Leap Frog Learning videos. They are SO good!
We have the Letter Factory which teaches all of the letters and their sounds in a really fun, memorable way.
We also have the Word Factory which teaches how letters work together to make words.
Then we have the Storybook Factory which shows how words work together to make stories (including punctuation and such).
We also have the Math Circus which teaches about numbers and groups of numbers including basic addition and subtraction.
Finally, we just picked up the newest one, Let's Go To School which compliments the other videos by teaching about letters and numbers too, but it also includes animal families, calendar, clocks, basic school rules and other things kids will experience as they go to school for the first time.
Anyway, they run about $10 at Wal-Mart, but I recently picked up the newest one at Costco for $6. I think you can probably find them on-line cheap.
All that to say, I highly recommend these. It's much cheaper than preschool, but covers all the basics in a really fun, creative, memorable way! And, I have no problem regularly putting my kids in front of these movies. That's how they all (including Hope and Logan) have learned their letters, sounds and numbers. Titus was spouting off his letters and their sounds as soon as he could talk!
There's my promotional plug for the day :0)