Those software you can see: archlinux, xmonad, swiftweasel, vim, screen, weechat, rxvt-unicode, pidgin, dzen, Breeze Tissue
Those hardware you can see: LG 21" widescreen lcd, lenovo thinkpad x61, microsoft wireless 2000, Palm
Finally I throw WMII away and turn to xmonad. The only reason is that WMII has very poor(nearly none) support to multi display (xrandr), which is perfectly supported by xmonad. Xmonad is faster than WMII+ruby, since xmonad.hs will be compiled to binary file by GHC instead of executing by interpreter.
The whole system is running on my X61 box, the 21" lcd connects to the laptop, make a more larger virtual screen together with X61's lcd. This can be achieved easily with xrandr. Now I can always keep an eye on irc and pidgin :-) For comfortable I bought microsoft wireless keyboard+mouse (works perfectly with linux, amazing), though I love thinkpad's trackpoint very much. The reason I use X61 instead of a desktop box as the core is that I don't need to synchronize between office pc and my laptop now, and I can use the big wide screen at the same time.
Haskell, xmonad's implemtation language, has an interesting static type system. Seems I'm still prefer static type and compiler after long use of ruby :-)