ISV/Support
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[edit] Community-Based Support
There are e-mail discussion lists for almost all topics surrounding KDE. An overview of these lists can be found here.
Particularly the kde-devel mailing list is of interest to everybody who want to develop KDE-based applications or want to develop for KDE itself.
Please keep in mind that all these lists are largely driven by volunteers - demands and threats are sometimes met with cynicism and rejection, while technical questions and legit criticism is usually dealt with quickly and nicely.
[edit] Commercial Support
If you need guaranteed response times and business level support, there are several options to chose from:
Trolltech provides commercial support for their Qt-Toolkit, on which KDE is based.
A list of companies supporting KDE can be found in KDEs Business Directory.