Via the e-newsletter of the excellent Democratic Audit of Australia:

Compulsory voting
Following the Joint Standing Committee on Electoral Matter’s recommendation that compulsory voting be scrapped, the Australian Electoral Commission has published this review of the arguments and includes some information from abroad.
* Read AEC compulsory voting paper
Ironically, the influential British think tank, the Institute for Public Policy Reform, has recently recommended that compulsory voting is the best solution for the ongoing problem of poor turnout.
* Read IPPR compulsory voting paper