One thing your visitors will not appreciate is your site taking more of their time than it needs to. One thing which you may think is a cool addition is the splash page. Hey - it delivers your logo straight to your captive audience, and you can even play a cute flash video with matching audio! Bad move. When someone types in YourSite.com, they want to see the information that they are looking to find in the smallest amount of time possible. Any type of introductory page will take time to load, and usually requires a click for the reader to move on and get to the content navigation tools. My advice is to simply leave it out - it is useless and really is more of a turn off if anything.