ITT VIS released the IDL 8.0.1 patch this afternoon. From the press release:

A patch release, IDL 8.0.1, is now available. This is a planned release to follow up the major changes that were introduced in IDL 8. It contains over 100 bug fixes plus 5 new features:

  1. arrow function,
  2. MAPGRID BOX_AXES property,
  3. Multiple IDL graphics can now be saved to a single PDF file,
  4. New graphics and object graphics now allow for thicknesses < 1.0 (0 is a thin hairline),
  5. WRITE_PNG now allows the horizontal or vertical resolution to be specified

For installation instructions, see Bill Okubo’s post to comp.lang.idl-pvwave.