For reference, to calculate shipping on a New Zealand TiVoHD 320GB;
Packaging dimensions 47 x 39.5 x 18 cm
Weights
Unit (with HDD) 3.95 kg
cables (power, component, A/V, RF) 0.48 kg
documents 0.14 kg
wireless adaptor (and USB cable) 0.13 kg
remote (no batteries) 0.12 kg
packaging 1.30 kg

Total: 6.12 kg