The folks over at Slashdot are reporting that Intel has released a Linux Driver for Centrino!
Finally Intel has made their different announcements about Linux support for the WLAN part of the Centrino technology become true. Though not yet officially announced an Open-Source driver with included firmware is available at SourceForge. The driver is still experimental and supposed to work with 2.4 Kernels as well as with 2.6 ones."