The ArcObjects Developer Kit contains numerous ArcGIS utility commands and routines that may find very useful.

Installing the samples is not as easy as ESRI makes to appear. Here's the lowdown on how it's done.

Install the ArcObjects Developer Kit from the ArcGIS install CD if you haven't already done so.

Click Start->Programs>ArcGIS->ArcObjects Developer Help and locate the sample that you wish to install. Read the install instructions.