For those looking for the sk98lin driver source who don't wish to recompile the kernel to include it, you can download it from this link ==>
SK98LIN
That is the 3Com driver downloads web site. It's the first driver listed on that page. Use Installation Mode, not Kernel Patch mode when installing. This has worked fine for me on an old Debian and on Slackware 10.2 with the 2.4.31 kernel.
When I compiled 2.6, however, I turned sk98lin on in the config, obviating the need to separately install it.