Today the Xampp 1.7.7 version was released:
"It took nearly eight months to get this new version of XAMPP released. A long time, but somehow this year it was harder than usual. Alone in the last four weeks, there were two new versions of Apache, two new versions of PHP and even two new versions of MySQL.
But let's get to the point: What's new in this version?
This time we updated Apache to 2.2.21, MySQL to 5.5.16, PHP to 5.3.8, and phpMyAdmin to 3.4.5, as well as the usual minor updates of libraries or system-specific components."
The new package seems to work very well on TC (including version 4.0rc2). Perhaps it would be a good idea to update the apache, php, and mysql tc extensions to the same level.