I just got a TiVo HD this week and it's the first TiVo (not dvr) I have owned. I have a couple basic questions: 1. How can I tell how much space is left on my TiVo? 2. Can I customize the menus? Like add things I use a lot (maybe weather or music) to the main menu? 3. Is there any "work-a-round" to be able to publish shows (like divx) to the TiVo? 4. Are there any "must have" addons I should get?