My toddler and I often spell out words together. He announces what he wants to write, then I help him spell the word, and he types it on the computer. We've been doing this every so often for over a year.
A typical list is below, but tonight he added his first sentence. I was very proud.
DADDY MOMMY COLEMAN FAMILY MADDIE DORRIE POP MOM KELSEY LEILA GRANDMA BEER DADDY DRINKS BEER.