Inspect the contents of a .wsp solution file

Did you know a WSS deployment file with a .wsp extension (the kind you create using .ddf files and makecab.exe) can be renamed with a .cab extension and its contents inspected in an archive viewer? You can also deploy a .cab file directly to MOSS via stsadm so for convenience our build scripts output a .cab file; if we ever need to double-check the presence of a particular file it's easily opened with 7zip or something similar. 

To do this yourself, simply rename the file output by makecab.exe by modifying the CabinetNameTemplate setting.