For those who delve deep into character sets, and those who want to test against a fairly comprehensive set of characters, Rich Schwartz has created the "All Unicode Characters DB" and made it available via OpenNTF.  Rather than point you straight at the download, I am pointing at the blog post Rich wrote about the database, as it has important caveats and explanations.  Mostly, I just wanted to express my gratitude for the resource to Richard.

Now In The Code Bin: All Unicode Characters DB