For a couple of years 4TM have been developing web pages in UTF-8. Nowadays every modern browser knows how to handle UNICODE charsets and the advantages are big when we have visitors from all over the world.

UNICODE charsets are becoming very popular these days and it was not a surprise that -according to Google's indexes- this year 2008 the UNICODE charsets are the most used charsets for web pages, surpassing ASCII and Western Europe (ascii + accented characters) charsets. 

Source: http://googleblog.blogspot.com/2008/05/moving-to-unicode-51.html