in your example, 1 would be a folder.  Inside that folder he would have a
file like default.asp, index.html, etc. so that it could also look like
http://www.yourdomain.com/article/1/ or
http://www.yourdomain.com/article/1/index.html.

As far as querry strings, if you dont like them, consider using hidden fields
to send the data if you don't like them showing.

Often, a site will have a filter sitting in front of the webserver that
intercepts requests and reformats them.  For IIS, this is often done
with ISAPI.

Basically, you'll write a little C++ or Perl program that takes strings
like #1 below, and turns them into #2 below.  This was pretty popular
back in the day, but has fallen out of favor lately.  Probably because
ASP.NET doesn't do it for you, and you can't write ISAPI filters in C#.

1. http://www.yourdomain.com/article/1 and
2. http://www.yourdomain.com/article/somepage.aspx?id=1

Jason Kester
Expat Software Consulting Services
http://www.expatsoftware.com/

The example you showed would probably have been run through an ISAPI
filter as others have mentioned. That allows you to do pretty much what
you like with the incoming URL and send the request on to another URL,
including querystring values as you wish. URLReplace (by a Czec fellow
whose name escapes me at the moment) is a well known and free ISAPI
filter that does just this.

You can do the same in ASP.NET if you are prepared to live with an .aspx
ending on the URLs. Thus you can have ...

http://www.yourdomain.com/article/1.aspx

and have it mapped invisibly to ...

http://www.yourdomain.com/article.aspx?articleid=1

You need to write code in Application_BeginRequest to grab the
Request.Path and parse it for the info you want. Build the real URL,
including the querystring and then use Context.RewritePath to send the
request on to that URL.

You don't actually need HttpHandlers and so on. I have no idea why all
the examples of URL rewriting use them. It took me ages of confusion
before I discovered how simple URL rewriting really is.

Hope this helps.