Yes I also find it very aesthetically pleasing. And it's also very functional as well. For eg, see the search on the Reference page: http://www.iolanguage.com/scm/io/docs/reference/index.html

Steve Dekorte, the creator of Io, also uses same site design on his on website/blog: http://dekorte.com/

It's just off-balance, with all focus on "io". Talk about a beautiful name as well.