Puppy Linux and antiX Linux use 2.6 kernels.  Damn Small Linux is the only distro (or at least the only well-known distro) that I know of that still uses 2.4.

On Wed, 04 Aug 2010 22:20:48 -0500
Timothy Aanerud <taanerud at comcast.net> wrote:

>   Do any of the lightweight's use a 2.6 Kernel?  The last time I looked 
> at Damn Small Linux it was using a 2.4 kernel.
> --
> Timothy.
> 
> On 8/1/2010 10:59 PM, Jason Hsu, embedded engineer, Linux user wrote:
> > If we still need a speaker, I could give a presentation on lightweight Linux distros.  I'll need the projector and an Internet connection.  I can show how various Linux distros perform in Virtualbox when allocated just 256 MB of RAM.  I'll demonstrate Ubuntu, antiX Linux, Puppy Linux, and other distros.
> >
> 
> 
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-- 
Jason Hsu, embedded engineer, Linux user <jhsu802701 at jasonhsu.com>