<p>Our development team work with Borland C++ Builder 6 and CodeGear C++ Builder 2007 (as well as Visual Studio). I hear a lot of comments that the Builder 2007 IDE crashes a lot more than BCB6 does. Does anyone out there have any experience of the C++ Builder 2009 IDE yet, particularly with a decent size application, and if so how does this compare with 6 or 2007 in terms of overall robustness?</p>

I haven't used C++ Builder 2009 but maybe this will help you.
According to Chris Pattinson (QA manager at CodeGear), they made over 4000 fixes in both Delphi and C++ Builder 2009 (See this blog:
http://blogs.codegear.com/chrispattinson/2008/09/19/38897
)
He links to an article on cn.codegear.com which details all of the fixes for C++ Builder, see
http://dn.codegear.com/article/38715