Hi xizwyck,
Actually in the future we are expanding our hosting services to completely accommodate many new languages and products and frameworks real soon. In terms of being number 1, that was an independent company that rated us as to being the best host for small to medium sized businesses. So while we may not meet every single businesses needs we do meet the most needs for the most number of businesses and we are working to meet even more businesses needs.
Also AJAX is just javascript and xml feeds, and doesn't rely on a specific server hosting requirement other than using the proper coding. If you are having issues with that specifically you might want to post a question
here We are .net 2.0 compliant and you can do ajax with that. We also have PHP hosting and if you know what you are doing you can setup ajax apps there too.
Joe