Preview images in Vista and AutoCAD 2008

Not really Vista WOW but it's great anyway with the AutoCAD 2008 support for these large previews in Vista. DWG as well as DWF has up to 256 x 256 size thumbnails. It's useful to be able to switch to preview to quickly visually find the drawing you look for.
Notice how the DWF also shows Shet Name, Sheet Size and Number of Sheets.