This week's book giveaway is in the Testing forum. We're giving away four copies of The Way of the Web Tester: A Beginner's Guide to Automating Tests and have Jonathan Rasmusson on-line! See this thread for details.
Not really possible in browsers. You can't even swap to a 'Please wait' page. Personally I think you are better to provide a explaination that the operation may take a while (like the way they do it at hotmail) and leave it at that. Dave