Couple of things to add to the defaults

[CobraA1]

These are easily added in the setup, but IMHO should be part of the defaults for SpaceMonger:

*.7z files should be added to the [Packages] slice on the pie chart. They're a popular way of compressing data for people who want an open source alternative to RAR files.

\Program Files (x86) should be added to the Program Files slice on the pie chart. This is where 64 bit versions of Vista store 32 bit programs - which is the vast majority of software these days, so it's a pretty big part of the slice missing on 64 bit machines.

\Users should be added in the [Personal] slice. This is Vista's replacement for "Documents and Settings."