NetBEUI for 2.4.24
Nikolai Zhubr patches to early work by Arnaldo Melo on porting the Procom, Inc donated stack for 2.0.36 to 2.4 is available here.
Pavel Vasilyev supported upto 2.4.34.1, and patches available - http://linux.nextmail.ru
Nikolai also has the patches for samba 2.2.8.