This tutorial uses VST version 1 (version 1.14 of the Delphi VST sdk). It shouldn't be a problem compiling a plugin written for VST 1 with an sdk for VST 2. See the Versions of VST section for more information.

Lessons
What is a VST plugin ?
Creating your own effect class
Working with parameters
The fearsome Process() and ProcessReplacing()
Programs
Your own editor
Getting your plugin under the attention of Cubase: main()
Versions of VST
The units of the Delphi VST sdk

Examples
dexample.zip
doubler.zip