I ran some stats on the latest ChangeLog from the new kernel that came out today.

[root@labmachine root]# perl kernel-stats.pl ChangeLog-2.6.3
Size in bytes: 307228
Number of lines: 9474
Unique contributors: 224

Top contributors:
akpm@osdl.org submitted 295 patches
perex@suse.cz submitted 277 patches
tiwai@suse.de submitted 140 patches
benh@kernel.crashing.org submitted 102 patches
shemminger@osdl.org submitted 75 patches