Valgrind is cool. Not everyone can afford to buy Purify, so Valgrind is the best choice (and it's free/GPL). Anyway, just after using Valgrind for minutes, I start to detect many leaks and other bad things in a few of my old programs.
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!