Try:-

It has to be something mapped to the aspnet process (to be rewritten by aspnet), so if you piped all requests through the aspnet process, then logon would work. This is the reason we create folders for sub-portals.

By default, images, html documents, etc are not piped through the aspnet process for performance reasons.

Depends if the page you are going to requires a lookup, you'll notice with the tabID it can extract the tabID from the URL.

What are the urls you have now for those pages?

It is possible, but requires some IIS changes. By default a request to a non-existant physical file like SubmliminalThought would get handled by default 404 handler from IIS and never enter the ASPNET process to be rewritten.

The first step is to make all requests go through the ASPNET process. This will incur a little extra processing on the web server's behalf as it will send images etc through the aspnet process. To map all requests to the aspnet process see this article here:-

http://www.dotnetdevs.com/articles/AttributeBasedURLDispatch.aspx

(the section is under "does it work for all urls" and will show you how to do this for Windows 2003)

Now that all requests go through the aspnet process we can rewrite that request if its in our rules.

Here were the rules I added for www.ventrian.com:-

There is also an issue using this method with child portals (www.domain.com/child) because it will check for that url instead of using the default.aspx as a default document. But if you don't use child portals you are OK.