Baen is one of my favourite and most visited commercial ebook sites. I've got and have read all the Honor Harrington books (except At All Costs, out this month, woot!). John Ringo is another favourite, but there are so many good authors being published there, and so many ebooks are free (and those that aren't are DRM'less, which is another big plus in Baen's favour).
If anyone likes sci-fi or fantasy, and hasn't been to Baen's website (
http://www.baen.com), do it!