I haven't leveraged ISAPI DLLs in a number of years but I am considering their use in an upcoming project.

I haven't leveraged ISAPI DLLs in a number of years but I am considering their use in an upcoming project. Has much changed in this arena as far as problems debugging/updating the DLLs? One thing is new - I can more easily create a stand alone application for help with debugging - but what about version updates, is there a pattern for that these days? I was debating on having a proxy DLL up front which decides which version to submit the request to.