Is very useful for RAPID application development. Is very ready for general application development. Get yourself a used Delphi 4 -> 7 book from Amazon or Abe books and *alot* applies.
If you need to write basic utilities for import/export file cleanups, or other mind numbing conversions for use by clueless staff, this is the way to go!
There is even a basic WSDL component: http://wiki.lazarus.freepascal.org/Web_Service_Toolkit