I have created a robot on kernel.org which makes incremental prepatches 
available.  It looks for standard-named prepatches in the 
/pub/linux/kernel/v*.*/testing directories, and creates incrementals in 
the corresponding /pub/linux/kernel/v*.*/testing/incr directory.
For example:
hera 86 % cd /pub/linux/kernel/v2.5/testing/incr/
hera 87 % ls -l *.gz
-rw-rw-r--    1 kdist    kernel     177158 Nov 27 10:17 
patch-2.5.1-pre1-pre2.gz
-rw-rw-r--    1 kdist    kernel     102202 Nov 28 15:35 
patch-2.5.1-pre2-pre3.gz
-rw-rw-r--    1 kdist    kernel      52955 Nov 29 15:29 
patch-2.5.1-pre3-pre4.gz
-rw-rw-r--    1 kdist    kernel      53616 Nov 30 17:04 
patch-2.5.1-pre4-pre5.gz
The naming and function of the patches should be obvious.
.bz2 and .sign files are available too, of course.
	-hpa
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