I chose to delay release of 4.00 as we are hopefully within a week of releasing 4.01. We currently expect to get a Final Release Candidate out tonight for testing on both XP and Vista.
Hoster requires Internet Explorer 7 to run reliably. This is standard with all Vista versions. For XP users, upgrade now so you will be ready to install and run Hoster 4. The new Show Display with 4 views (Lyrics, Intermission, Audio DJ, and Video VJ) runs from a customized version of Internet Explorer, free of all cluttering controls.
Some of our testers also found that XP SP3 makes Hoster run better. You can download and install this over the Internet free by clicking your Windows Start button, then the "Windows Upgrade" link. Select "Custom" versus "Express" and allow it to find everything you need to install before installing SR3.
We have used the latest technologies available to make Hoster the most advanced product on the market today. 
Current target release is Friday, July 11th, or Monday July 14th.