Although probably no one cares about Classic ASP, except those who still need to support it, I was refreshing my memory today on how to use classes in Classic ASP and found a couple of options for simulating constructors with parameters.
If writing database queries in SQL in Classic ASP for SQL Server, rather than using ADO or parameterised queries, you can use these functions to correctly format your data and protect against SQL injection.
Looking at the Google search results, it seems that there has been plenty of demand to share Session values between Classic ASP and ASP.NET. This is usually a result of supporting legacy Classic ASP.NET with new development in ASP.NET.
When developing websites most of them have common elements like headers, footers and navigational menus that are common throughout the site. In Classic ASP we mostly use multiple server side includes to accomplish this. I like ASP.NET master pages and this page details the technique I use to achieve something similar in Classic ASP.