I am using the Out-Of-The-Box preview viewstyle for displaying a list. My requirement is to display and extra column on the left side of the the view, along with the title column. How can I do this?
Sadly, there is no easy, SUPPORTED way to do this. You would have to modify the preview ViewStyle (as defined in C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\GLOBAL\XML\VWSTYLES.XML) to display your column. Now this can certainly be done - display CAML is painful but not impossible, but it would modify the preview viewstyle on your entire sharepoint install. See http://mo.notono.us/search?q=viewstyle for more info
Another way to do this MAY be through javascript (I'd use jQuery), though I am not entirely sure HOW you'd accomplish it. I do know Paul over at EndUserSharePoint.com has done some amazing things with client side script...