I just noticed this on Nigels Blog
I was recently asked how to change the search results for SharePoint Portal Server 2003 so that when a user selected a document from the search results, instead of actually opening the document which is the current default behaviour of SPS, that the user should be directed to the documents’ details page within the relevant WSS site. This is because typically some users actually want to view the documents details before deciding to open it. This also gives the user the ability to check out the document before opening it, etc.
See the screenshots, and get the web part on Nigels site