Do you run all of your accounts from 1 computer?? If you do, keyclone is a great solution for you.

Asside from keyclone just cloning keys it also has a function called Maximizer. Using Maximizer you can setup the Picture in Picture (PiP) function.

First of all my screen resolution is 1920x1200
Using maximizer i setup 5 screens to be displayed.. 1 at 1600x1200 and then 4 at 320x240. looks something like http://www.solidice.com/keyclone/maximizer_01.jpg
here's how I learned http://www.solidice.com/keyclone/commands.html

Once you set that up, you then set keys to change which character you are controlling in that Large Screen.

So on my setup when I push my uparrow i am controlling hellzchildw on the large screen and then in the game i have a macro that tells every character to FOCUS hellzchildw.
When i push my downarrow, my large screen changes to hellzchildy and then in the game i have a macro that tells every character to focus hellzchildy

OK so now.. what are the marcros??
Now this is hard to explain on paper but i'll try.
We already setup maximizer so that when I push my uparrow hellzchildx is the toon that i control on my large screen.
Now, in the game hellzchildx uparrow is set to this macro

/focus hellzchildx
/target focus
/follow
/assist focus
/changeactionbar 1

Now, ALL of the other toons uparrow key is bound to this macro

/focus hellzchildx
/target focus
/follow
/assist focus
/changeactionbar 4

THE ONLY DIFFERENCE IS THE /changeactionbar .
Actionbar 1 of every character has their spells pulled straight from their spellbook, 1=lightning bolt 2=chain lightning 3=earth shock ..
Actionbar 4 of every character has their spells pulled from my macros list, so 1=MACRO(/assist focus /cast lighning bolt) 2=macro (/assist focus /cast chain lightning) 3=macro (/assist focus /cast earth shock)

hope it helps, if you need more in depth explanation let me know