www.raggs.com.au

It's got lots of songs - all the words, you can download & copy & there are activities too. 

Here are a few my sons liked

www.bobthebuilder.com/au/main.html

www.hotwheels.com/worldwide/index.aspx?Lang=EN

http://harrypotter.warnerbros.com/

if l think of any more l will post them

For a girl of age range 3 - 6, there are two camps basically - Camp Barbie or Camp Disney Princesses. My one likes the former and her favourite site is www.barbie.everythinggirl.com. It's quite fun and allows you to play dress up on Barbie (coordinatng outfits, applying makeup, changing hair colour etc). Hope this helps!

http://disney.go.com/playhouse/today/index.html

http://www.cartoonnetwork.com.au/

http://www.care-bears.com/CareBears/authcredentials.do

are my daughters faves... also ABC kids as already said

these two are our favs b loves playground radio:

http://www.thewiggles.com.au/au/entertainment/

http://www.abc.net.au/children/playgroundradio/

http://www.abc.net.au/children/default.htm

my kids go to free on line student stuff   they have games thing for school  and   others sorts  i hope this help