Unfortunately it seems that Xinu's site is down at this point. I tried Popuri just now and they both seem like mashups of screenscraping/public api content. Not too hard to do, but still interesting.

Both of these sites seem somewhat parasitic: they exclusively use other people's content. Are these other sites really benefitting from their data being used like this?

Not really sure what those kanji mean together. Taking the characters' individual meanings I'd make up something like "inside the letter", but its probably idiomatic Chinese and means something completely different.