I've been working with Telerik's RadTools set of components for over 2 months, and keep finding new things to like. Stuff that used to take me hours to code in Classic ASP I can now accomplish in under an hour.

For example, I can setup a SQL Datasource, drop in an instance of RadGrid, bind it to the datasource, and presto ... I have an editable grid. Add features like sorting and grouping, it really makes things easy!