Google posted a blog about unicode use on the web http://googleblog.blogspot.com/2008/05/moving-to-unicode-51.html They also announced that they now support Unicode 5.1, which is probably a good thing, but I found the graph most interesting http://bp1.blogger.com/_Ap14FtNN91w/SBzrtHJfLnI/AAAAAAAAA5U/TV7_g2_sWq0/s1600-h/Unicode2.gif.
The graph shows UTF-8 as now being the most prevalent encoding on the web, with a steady decline of ASCII and declining trends for other common encodings. That's got to be a good thing for character portability between machines on the web. Lack of proper declaration and use of encodings is one of the biggest problems with interoperability on the web, its nice to see Unicode gaining ground. The rate of growth is also really good, a nice strong curve there at the end :)