Move Your Domain Day started on December 29th, 2011 when Namecheap and Reddit users teamed together to spark a mass exodus from registrar and hosting companies that did not support a free and open Internet. Since then, Namecheap has hosted an annual Move Your Domain Day, raising funds for the Electronic Frontier Foundation.Check out the Reddit thread that started it all!
Basically they will donate up to a couple of dollars per domain transferred and it's way cheaper than the $12 usual price. It's worth noting for .com, .net, .info and .org namecheap are usually way cheaper than any Australian registrars. Also you get free whois privacy for the first year.
It's also worth noting you can't transfer a .au domain into Namecheap. They have a good reputation though.