The icons in Vista beta 1 scale really well...They size, then appear jaggedy then they anti-alias, if not then its a very fancy bilinear filter Tongue Out

Infact i was randomly browsing, and was quite surprised at these (i had to take the pics fast before the live icons appeared)

Jpeg Icons

PNG/Gif Icons

Bitmap icons

Font Icons

Theres also added icon resources in system32.dll which cannot be opened by reshacker but form up a 1:1 match (count) with the new fixed-size icons.