An increasingly popular thread on Apple's discussion boards appears to pin WiFi problems some MacBook users have been experiencing on the Mac OS 10.4.10 update. Users with the issue appear to experience symptoms ranging from WiFi dropouts to kernel panics.
Gaging the severity of a problem is always difficult to do from forum threads, as typically only people who have issues voice concerns. However, Mac OS 10.4.10 has had its share of bugs, already being patched once due to an audio issue with Intel-based Macs.
Update: Reports indicate that Apple's engineering team has acknowledged the issue as a bug and is working towards a resolution.