WBT's Three Star Homework model, the students practice their math facts (currently multiplication) each night. I just found these great self-grading timed quizzes from Fun4theBrain that I am going to let the parents know about for an extra way for them to practice their math facts. They can fill in their name, take the test, then print out the results.
I might also have this as an activity during our weekly computer lab visit. If they don't pass a particular level, they can take it home to correct or complete.
I found this site while blog stalking 4th and 5th grade happiness. She has a lot of great resources, so be sure to visit her blog as well! :)