How old are your kids? We subscribe to
www.readingeggs.com.au for our six year old daughter and she loves getting on line and doing her reading. You do have to pay for it but it's not too expensive.
She also has access to a program through school called
www.mathletics.com.au - does your school use that program?
As for other hints and ideas, our school puts information into our online newsletter so check out
www.coomeraspringsss.eq.edu.au and click on the newsletter link, there are things about Literacy, Numberacy, Weights and Measures etc in nearly every newsletter that has been published this year.