Some useful links (in no particular order) for the OWL Developer include:
OWL NExt
Patches and enhancements to OWL, including support for Visual C++.
The ObjectWindows Library Mailing List
The best mailing list around and the reason for OWL HOW's existence.
Borland Online
The latest information about and patches for Borland C++.
The Borland C++ 5.0 FAQ Page
Quick and easy solutions to problems you may encounter while
using Borland C++ 5.0.
prtStream... makes printing from OWL almost too easy
A class that makes printing from your OWL applications as easy as using
the C++ iostreams.
Geordie's Code Samples
OWL and other Windows Code Examples.
SoftEngage Homepage
Homepage for a software package written in OWL. Includes free OWL classes,
downloads and tips.
If you think there should be a particular link here, use the contribution form.