I use JQuery and asp.net web services all the time. Here's the JQuery that I use - it's a bit more explicit than other JQuery examples, but works great.

Simple Example There was a great article recently by Ryan Lanciaux named jQuery and the ASP.NET MVC Framework which outlines some key factors to using jQuery with the ASP.NET MVC Framework.

JavaScript and .Net developers are getting helping hands in application-building efforts, through separate projects intended to make it easier to use JavaScript and to document .Net projects.