I am currently typing this message on my Logitech cordless wireless pro usb keyboard. The mouse does nothing though dmesg shows:
hub.c: USB new device connect on bus1/1, assigned device number 14
usb.c: USB device 14 (vend/prod 0x46d/0xc505) is not claimed by any active driver.
usb.c: registered new driver keyboard
input0: Logitech USB Receiver on usb1:14.0
usbkbd.c: :USB HID Boot Protocol keyboard driver
usb.c: registered new driver hid
input1: USB HID v1.10 Mouse [Logitech USB Receiver] on usb1:14.1
hid-core.c: v1.8 Andreas Gal, Vojtech Pavlik <vojtech@suse.cz>
hid-core.c: USB HID support drivers
I have also been able to hook up an external usb cd-rw that I was able to read a cd. I really have not tried hooking up more then one thing at a time as of yet since I do not have a usb hub.
I will admit that I usually uses my Targus IR keyboard everyday. I would like to at some point get a cf video card and usb hub and try using my SL-6000 like you want to do. I have to say so far I really love my SL-6K, it gets used everyday, but I am a Unix admin and spend most of my time on other servers using Qkonsole to do my work.
I have found the Zaurus to be a great laptop replacement for me. I can read and edit both word and execle documents along with being able to view Powerpoint documents. With Gaim and qazoo to have icq, aim, and yahoo instant messages. For me it works though I am nto sure if it woudl work as a laptop replacement for everyone, though to me it is the best thing I have found.