Some really excellent sites don't seem to make a big first impression on me, but over time my eyes are opened to content that is really interesting.
Pocket PC E-Books Watch is a site that is growing on me that way. I'm sure I've visited before at various times, but didn't realize how much great material they have. All kinds of information about ebooks, the ebook industry, ebook technology, interviews, and other various sorts of content for mobile devices.
In particular, what fascinates me at the moment is the interview links.
For example, a sample of what I found by searching on "interview"...
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Comics One Profile
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Interview With Jeff Hawkins
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Rosetta Books
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Exclusive with Palm Digital Media (aka Peanut Press / Ereader)
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Founder of Project Gutenberg
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Cracking iTunes' DRM with JHymn