This is a setup that is very useful for me. It may or may not be for you. I will use it in conjunction with the A5 overlayed sv_SE layout.
The layout is subject to change (in particular I'm thinking about adding a macro recording feature), but it have not changed much the past year or two so you can expect it to be stable enough to learn it.
A5: http://aoeu.info/s/dvorak/svorak My xkb map: https://github.com/lindhe/dotfiles/blob/master/usr/share/X11/xkb/symbols/se-A5
I think the layout image can be found on www.keyboard-layout-editor.com
Easily accessible F11 key for fullscreening
Print screen
Middle mouse button for X-paste
Improved reachability of meta buttons (LCtrl, LALt, AltGr, LGui etc.)
Cluster Page Up/Down + Home/End by the right thumb
Vim-like arrow layout in right bottom row
Set media layer toggle to right thumb (Enter)
Set apostrophe on LCtl (putting it next to some other small characters)
The ErgoDox LEDs on this layout is using the two rightmost LEDs as the two LSB in a two digit binary number, representing layer 0, 1, 2 and 3. The leftmost byte/LED indicates CAPS status.