It is certainly a good idea to choose a navi software from a company that has a commitment to PDA navigation, and hence new maps and mapshare-like offerings will be compatible. TT does not in general, but currently has a deal in place to provide navi software and updates for selected HTC devices only (Diamond, Raphael). But only with V7 maps, the latest V8-maps are not offered. And if you want TT7 for your HD, you have to revert to the underground :)
But let me point out to Sygic Drive, a fine navi soft from Slovakia, sold as McGuider by TT-owned company TeleAtlas. http://www.sygic.com/
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