I just saw an interesting SAS Discussion Forum thread relating to the development of custom tasks for SAS Enterprise Guide 4.2 & 4.3. Chris@SAS posted a reply containing a number of links to resources. Looks like a very useful list so I’m filing it away in case I have a need to do any custom task work at a later date.
I saw there is also a SAS support site page on Creating Custom Add-In Tasks for SAS Enterprise Guide with examples, templates and documentation at http://support.sas.com/documentation/onlinedoc/guide/customtasks/