You can hack the HR10-250. Here's the easy way. However it was leaked that DirecTV has a version 6 TiVo software coming soon for the HD TiVo's. Otherwise it is still 3.1.5f, so it stays slow, and no show sharing/folders.
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-Michael

#040103696 on a shelf
Mk2a - 90 GB - Red - Illuminated buttons