Apple - iterm - what's the key-combo to switch panes?

⌘+⌥+←/↑/→/↓ will let you navigate split panes in the direction of the arrow, i.e. when using ⌘+D to split panes vertically, ⌘+⌥+← and ⌘+⌥+→ will let you switch between the panes.

Note: ⌥ is the [alt] key

Here is some useful keyboard shortcuts in iTerm:

• ⌘+left arrow, ⌘+right arrow navigates among tabs. So does ⌘-{ and ⌘-}.
• ⌘+number navigates directly to a tab.
• ⌘+⌥+Number navigates directly to a window.
• ⌘+⌥+Arrow keys navigate among split panes.
• ⌘+] and ⌘+[ navigates among split panes in order of use.