Matthew Langston has created a RedHat 6.1 rpm available here This rpm is for users of RedHat 6.1 using the kernel and card services that were originally installed by RedHat.
This driver has also been integrated into the development series of Linux kernels starting with 2.3.18. Here is some info on using the kernel driver The kernel driver works since pcmcia-cs-3.1.1 and kernel 2.3.18ac7, however, the pcmcia-cs package version of ray_cs is recommended for normal use.