However, the best spot to go for now is our Grammar Page. Loads of resources.
See all the grammar courses on EnglishCentral. Put them on and then assign to students through your class page.
More Grammar PPTS here.
Also grammar books here.
Grammar Worksheets here
Grammar Discussions here.
I love games, David. I think one of the best ways to teach/learn grammar is to play it as grammar lessons are usually so boring with no activity. Just the teacher should talk and students listen to him, or at least to ask some questions .Even these questions.(as I've experienced many times) often leads to get more confused. So, in this way(playing) we can make it fun and active as all students are involved in learning/teaching process. In addition, in games, usually you come up with so many new ideas.
Another nice game to practice comparative statements. from http://leofuchigami.com/lessons/. Some other lessons there, free to use from this retired teacher.
Here are some resources for teaching conditionals.
1. A nice grammar explanation ppt about all the conditional forms and how to make them
2. What if? Extensive list of interesting questions - see alsothis full lesson on What If?
3. If cards. Students match if statements with a possible action.
Loads more "conditional" related materials on the community.