For modem support check this site out. http://www.linmodems.org/
For the Linksys post the model number of the card. Also post the section from ' dmesg ' about the nic.
For the USB plug in the nic and post the last 20 lines from the dmesg command.
Unless any are atheros based or intel then you will need to use ndiswrapper to work with them.
Distribution: RHEL 5.1 with Pieces of this and that.
Kernel 188.8.131.52, KDE 3.5.8 and KDE 4.0 beta, Plus Development src.rpm, ATI fglrx64_7_1_0-8.433-1 rpm with 3D and DRI working.
Acer 5100-5840 with webcam, ati, sdcard reader, sound, atheros based wireless, all working. Only thing not working is the memory stick reader.