Andre has posted his extensive 27 page preview of Windows Vista RC 1, including over 20 screenshots. Here is an excerpt:

The Search Explorer in Windows Vista presents a simplified layout when launched. At first you will see an empty canvas with two hints, “To begin, type in the search box” and “To search more of your computer, use Advanced Search”. The Command bar, list the common content filters you can use to refine your search queries. Searching in Vista is very instantaneous, thanks to the new indexing engine, results immediately appear once you type in the search box, of course accuracy is not perfect, especially if you have tones of files relating to the same topic. But the tools are there to help refine your results; so I decided to use the Advanced Search tools and was presented with the familiar Criteria Fields from prior versions of Windows. In unison with the indexing engine, I was able to more accurately achieve the results I wanted by defining file types and locations. For instance, I was searching for Word documents with the topic Longhorn in them within a certain period from the Documents folder. Instantly I was presented with a list of Word documents that fit my desired results. I could take advantage of these results for future use by saving the Search Results, which would then populate the folder whenever files are created relating to the topic.