Someone asked about an ASP.NET application host a couple of months ago and one of the responses led me to DiscountASP.NET. I've been using DiscountASP.NET for roughly two months. So far, their service has been excellent. They have a fairly active support forum and the company representative that monitors the forum responds quickly and is very knowledgeable.

They are also responsive to customer requests. In the two months that I have been using the service, they have added two features that were requested by customers.

They have a good pre-sales knowledgebase that answered 90% of my questions before I purchased an account.