Installed IE7 last night.  At first,  when my machine rebooted,  it came up and sat on the BIOS screen for several seconds,  I thought my system had been screwed up… I turned off power after about a minute,  and it came back up the same way….so I waited.  It finally booted into Windows and so far,  I like it.  I hope WordPress can update their One-click bookmarklet to work with IE7 (it allows me to highlight and right click and immediuately open a post with the selected text and link to the site included,  which is the way I liuke to respond to things I read)