I'm somewhat reticent about studio websites. I know they are supposed to be the wave of the future, everyone will one day be accessing music education via the web, etc., etc. but at the same time, most private studio sites
The Martha Beth Lewis Piano Home Page
Not only is it her studio's home page, but it also happens to be probaby the single source of information on piano pedagogy on the internet, with exhaustive sections for teachers, parents, and students, all within a simple and homemade format.
Laura Claycomb's Young Artist Corner
Every singer has great pictures and an impressive bio and some even have great video and sound files, but Laura Claycomb's site has one of the most honestly written and down to earth guides on how to succeed and develop as a professional singer one is likely to find, free from hubris and out-of-date personal anecdotes one often finds in the genre.
This is the website of a teacher that genuinely cares about the development of her students and the art of teaching. Complete with articles, resources, links, student projects and contests, her personal handouts and teaching materials (some of which requires registration), and a complete chronicling of every aspect of her studio's operation, the online presence of this site gives Wendy Stevens a huge presence in Kansas. If you're a parent or student in the Wichita or Topeka areas and have visited this site, why would you even consider other studios?
So the bar is set rather high after looking at these sites. Stay tuned for more goodies on my newest website project--maybe the RCM will even let me use their logo.