Peter A. Bromberg wrote an article for eggheadcafe on ASP.NET: Remote Scripting using Thycotic Remote Scripting.  This is the second or third article in as many months that I've seen using Thycotic Remote Scripting, mostly in respone to AJAX and the fact that this isn't a new concept.

What's nice with all the "new" hype surrounding Remote Scripting, XMLHTTP, and Script Callbacks (baked into ASP.NET 2.0), is that we should start to see some really nice UI decisions.  Peter's article is a good example, if you're expecting mostly North American addresses have the tab sequence go from Street Address to Zip Code, and fill in City, State OnBlur.

Other examples?  Say you deal with vehicles for some reason (auto body shop, whatever), you could have users fill in the VIN Number of their vehicle and populate most of the Make/Model type questions.  Mainly situations where you can derive associative information from small, simple bits of information and still get adequate data while minimizing user input or "work".