1.  Merge one of the 2.6 kernels - I used gentoo-dev-sources.  
2.  Change the /usr/src/linux symlink to point to the /usr/src/2.6directory
3.  Cd /usr/src/linux and do a make menuconfig
4.  Go through the menu and select the options you want.  I don't recommend taking the 2.4 .config and running make oldconfig on it.
5.  Exit menuconfig (save!)
6.  Run make && make modules_install
7.  Copy the bzImage to /boot - mount /boot first if it's not already.
8.  Set LILO or Grub up so that you have another kernel entry it can boot - I call mine Test.

As for udev I went from 2.4 to 2.6 and just went with udev.  Check the Gentoo docs for some docs on links to other docs on moving to udev.


> 
> From: Maarten <gentoo@...>
> Date: 2004/12/06 Mon PM 05:47:43 GMT
> To: gentoo-user@g.o
> Subject: [gentoo-user] kernel 2.6 upgrade howto
> 
> 
> Hi list,
> 
> I'm new to the list (and gentoo) but not to linux.
> 
> I just started with gentoo, had to use the 2004.2 image since 2004.3 crashed 
> at installtime on my machine (thinkpad 600X)...  
> I used stage 2. Since then I succesfully installed a lot of apps like KDE and 
> such, but my kernel is still a selfmade 2.4 one.  Now I 


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