My daughter and I have been working on "at" words. I found these free printable phonics sheets.
These are a great supplement to the kindergarten hooked on phonics books that we are using. I particularly like the idea of making a memory game out of the at words. Just print two copies of the at flashcards. Cut and play.
This site also has some pre-printing practice worksheets that I'm going to print out as well as letter printing worksheets.