WINRAR FILE COMPRESSION
Menu location: GO > Programs > Winrar

I was completely sold on Winzip until I moved overseas and talked to a Russian man who said, "I think Winrar better."  Winrar usually compresses better, is capable of creating archives that span over multiple files, expands many "cab" and "exe" files that Winzip can't recognize, and can create highly-customizable self-extracting (SFX) executable files.