Paul Wilson started to talk about UI Mapping in July, and lately more and more people are talking about this concept.
Mats Helander has a complete series on various mappings (1, 2, 3, and up to 6). Roger Johansson is also talking about the concept and even has a prototype implementation (1, 2, 3).
Roughly, the idea is to use more mappings than just object-relational mapping, which is used to map your domain objects to a relational database. The first new mapping is between your domain objects and the presentation layer. This means we would have Relational Model <-> Domain Model <-> Presentation Model.
But I won't try to explain the concept, Roger Johansson and Mats Helander do this very well on their weblogs.
This goes towards a more declarative approach, and I think we need it because GUI code is the next pain in the neck after data access - a lot of code for nothing.
No need to say I'll follow this closely and even use it if possible.