KDE PIM/Akonadi/Qt developer and Kubuntu user.
Contributions to Ubuntu directly and indirectly have been made over several years. Primarily these contributions have been orientated towards making Kubuntu a first class development system for kde developers, improving the user experience with patches to KDE PIM and related technologies and with bug reports.
On KDE techbase I created Kubuntu specific documentation and maintained it for some time: http://techbase.kde.org/Getting_Started/Build/KDE4/Kubuntu_and_Debian
I also created the wiki page about how to use Project Neon to contribute to KDE: http://techbase.kde.org/Getting_Started/Using_Project_Neon_to_contribute_to_KDE
I delivered a session at UbuntuAppDeveloperWeek in October 2010 and blogged about it: http://steveire.wordpress.com/2010/10/05/grantlee-at-ubuntuappdeveloperweek/
As a KDE PIM developer I recommend KDE PIM patches for Kubuntu packages where relevant. I have also found/created several patches in other packages such as CMake.
I regularly file bug reports when I find them.
Continue with making the Qt/C++ Developer experience better.
Continue recommending Kubuntu to others.
Quality testing for pending KDE PIM relevant releases/packages.
More new developer assistance through programs like developer week.
If you know me and have something nice to say, please leave a comment here.