Is this what you mean?
http://www.hibiscusflorals.com/Silk_...ection_104.htm
If so, it's actually a pretty easy thing to do within IIS and ASP. What you do is you set up a custom 404 page to handle your dead link requests, and parse the URL information. In this case, the URL is checked for the product itself (Peonies & Cymbidium Orchids Collection) and the corresponding product detail is shown.
Note: the reason it says "andsign" in the URL is because I've found that the custom 404 doesn't handle & signs very well, and this is my own hack for it.
The only downside to this route is that in stats compilers, it shows /404.asp as your most common page, which is kind of misleading. But then again, so are "products.asp" and "productdetails.asp" so I guess it's six of one, a half dozen of the other.
http://www.4guysfromrolla.com/webtech/123000-1.shtml is where I learned about this concept for the first time. The only weak spot in the article is that the Response.Redirect command causes another call to the server. Use Server.Transfer and session variables instead of Response.Redirect and querystrings. It's much more search-engine and resource-friendly.
Note: you'll have to ask your host if they offer this. If not, there are a bunch that will including
Sectorlink (on their Multi-Bronze and higher packages) and *BLECH*
Interland, although I'm not sure which package because I haven't used them in 2 years.