Ask HN: Review my web app - Unicode Obfuscator

Hello all. I'm a soon-to-be graduating college student looking to get into building web apps. I have launched my first attempt at: http://www.unicodeobfuscator.com

It converts strings of normal ASCII characters into Unicode characters that look similar. A primary use might be to hide email addresses from spam bots. It might also come in handy in any other situation where text needs to be human-readable but not computer readable (maybe for use with a CAPTCHA of some sort?).

It also functions as a leet speak translator for those who are into that sort of thing.

Credit for the idea comes from this post: http://lkozma.net/blog/random-web-ideas/

The author says he got the idea from this Stack Overflow rant: http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454

Any feedback would be greatly appreciated.