yes i have some customers using that, but true, you don't see that very often. many of them using it in the first part of migration. some trying to increase the security of their websites.
i don't know if you know that one:
http://www.apache-asp.org/
Unfortunately, it does not support common scripting languages (e.g., VBScript/JScript). but Java System Active Server Pages is functionally and syntactically equivalent to Microsoft's ASP, and supports all the same ASP page syntax, runs on multiple web servers including Sun Java System and Apache, and multiple operating systems including Solaris, Linux and Windows. but with ASP.NET you have a problem, it is not the next generation of ASP, rather it is an entirely new and Windows-only development paradigm (info: VBScript are not supported by ASP.NET) and sun will not support ASP.NET in the future... so if you really have ASP.NET there is no other way then windows .... (yet
)
greeting PRESSY