Really, never ever. Especially when you’re running Fedora PPC. Unbootable system, very quickly gotten. Rescue without another system handy is a pain. My evening involved an Apache 2 installation on Windows, and making it serve me /Fedora/base/images so I could get into mac rescue mode. And yes, FC3 test1 is out, and I think nasrat should have some PPC ISOs ready for testing (soon).
Otherwise, some troubles getting the Conexant HCF (controlerless) driver for the iBook G3’s modem working on FC2. Stock Fedora kernel’s don’t work (4k stacks vs. these requiring an 8k stack). And when they do compile on a standard kernel.org one, hfcusbserial tends to not load on a 2.6.7 kernel – anyone else have success?