Well, I've finally started to work on my dream of producing the kind of games and worksheets that I wished I could have bought when I worked as a full-time music teacher. There was never enough time to create all the pages that I wanted and needed for my students. Putting the pages together takes a lot longer than I thought, but I'm having fun and I hope they'll be a great resource to others.
Many of the pages I have used with my past students. The game described below works very well. The kids are completely engaged in a rhythmic activity and it gave me time to assess whether or not they could identify rhythms with ta, ti-ti and the quarter rest.
Below is a picture of a rhythm game I've made for Grade 1. To play, students match the first four beats of a song with the correct rhythm card. I've designed it so that it is self-correcting. Also, there are multiple sets of each game, and each set has a distinct picture so that students can easily tell if they've gotten a set mixed with another. I have four different versions for Grade 1. I've been using the rhythms listed in "The Koda'ly Method" by Lois Choksy to decide on which songs and rhythms to use for each level of the game. A few of the songs are from "Musicplay 1" by Denise Gagne.

Here's a practice page using "Engine, Engine #9" for identifying so-mi on a two-line staff. I was always frustrated whenever I tried to find theory sheets that were simple enough for very young students. The other problem was that the pages would be very "dry" visually. I try to make the pages more fun by using illustrations for the notes instead of simple circles. I think that using "picture notes" gives a better transition from iconic representation to placing sounds on a staff.
Below is the simple circle page. Do you think it is better than the previous one? (Sorry for the line. My printer is having issues!)
My main dilemma at the moment is deciding on which versions of some songs to use. Some scores write "Starlight, Starbright" using mi, so and la while others only use so and mi. This is the same for "Rain, Rain" and a bunch of other songs. Any ideas on what to do?
I'll try and post a free sample of one of my pages, just as soon as I figure out how to make it downloadable for you! :)