Introducing Snapshot
Snapshot is a product from TheFARM which allows you to export an Umbraco website into a static ASP.NET website which you can run without an Umbraco back-end, but still using the standard Umbraco features such as XSLT and Macros.
Here's some useful links about Snapshot:
Snapshot API
Snapshot actually consists of two components, an Umbraco (or CMS) API and a Snapshot (or published site) API.
We've decided that we will release the Snapshot CMS API as a free download. You can see the announcement post here: http://farmcode.org/post/2010/06/24/Snapshot-CMS-API.aspx