Quite a few actually. Going on modifications alone, which is no accurate indication of the total number given I don't see them all as not everyone wants theirs modded, there would have to be at least a few dozen of these alone.
In reality there are close on 1,000 active TiVo's in Australia alone and Warren Toomey keeps a log of what ones download what guide data for any particular area given he can quantify this from the Guide Data server. Might pay to have a look around the oztivo website at www.oztivo.com and see if you can find the list somewhere.
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