In 2010, I was privileged to serve as a judge in the ACM ICPC South African Regional Contest.
In January and March/April 2009 I delivered a data structures and programming course at Esslingen University of Applied Sciences. The 36 90-minute classes were largely based on Andrew Troelsen's brilliant Pro C# 2008 book.
Since its first incarnation in 2005 the GI InformatiCup has become ever more popular. I devise problem sets and judge submissions.
I maintain a short list of computer science books I like.
Consider participating in the current InformatiCup programming contest.
Contestants from Karlsruhe won a gold medal at the 2007 SWERC and a silver and bronze medal at the 2008 SWERC.