Problem running ArcObjects in ArcGIS 9.0
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After installing ArcGIS 9.0 there are some new Object Libraries
which have new names.  Some old ones, such as the 

  ESRI Spatial Analyst Extension Object Library, and
  ESRI Spatial Analyst Shared Object Library

are not included in ArcGIS 9.0.  The are, apparently,
replaced by

  ESRI SpatialAnalyst Object Library and/or
  ESRI SpatialAnalyst ObjectUI Library

When running ArcObjects programs in 9.0, that were
doing just fine in 8.3, there may be an immediate error
upon activating the program that says:

  Compile error:
  Can't find project or library

The solution is, within VBA inside ArcMap, to click the 
Reset button then go to Tools > References... and then uncheck 
the boxes next to:

  MISSING: ESRI Spatial Analyst Extension Object Library and
  MISSING: ESRI Spatial Analyst Shared Object Library

then click OK.  After doing that the two missing library 
names simply disappear presumably to be supplanted by the

  ESRI SpatialAnalyst Object Library and/or
  ESRI SpatialAnalyst ObjectUI Library


Re-running the old program should work at that point.