Hi d2b,

I lived in Doncaster at the time I did a student prac, in about 2006, so visited a lot of centres in the area to check them out.
The one on Turana St is pretty good, worth a look.
If you can stretch to Box Hill, I highly recommend Central Box Hill Children's Services Centre, but only if you want care in 2011 or later, I imagine their waiting list would be massive.
Watts St in Box Hill is also good.

Also check out Manningham council FDC.