I still use Valgrind memcheck for memory leak verification of a large piece of code I have developed, with a long end-to-end test.

Also, it has a nice integration with Eclipse which reflects the Valgrind memcheck output to the source files directly, enabling you to see where problems are rooted.

All in all, Valgrind is a great toolset.

P.S.: I was pronouncing Valgrind correctly! :)