TPG first announced plans for an "unlimited" broadband service way back in September 2012. That deal is finally available, but as with any purportedly unlimited deal, it pays to read the fine print carefully.
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TPG's cheapest offer is $59.99 per month, for the slowest-speed 12Mbps download/1Mbps upload deal. (If you're in a good ADSL2+ area, note that you can probably score better speeds than that already). $69.99 a month keeps the same speed but adds line rental with unlimited landline calls; $79.99 is the same deal with free calls to mobiles.
If you want faster speed from the NBN, $89.99 scores unlimited access for 100Mbps download/40Mbps upload. Again, you can add another $10 for the landline calls deal, or $20 for the landline/mobile comobo.
One big change since the idea of the plan was first announced is that you're no longer locked into a contract. The trade-off? A $129.95 set-up fee. (To our mind, that's a fair trade.)
TPG isn't the first plan to offer "unlimited" NBN access -- AusBBS did it back in May last year. It's certainly not a terrible deal if you're in an area where TPG offers it, though the future of how the NBN will expand remains uncertain, untimed and uncosted.