A comparison of the features (or more-so just a table of notes for accessing some of those features) for 
GNU screen and BSD-licensed 
tmux.
This document released for use under the PPL license available at 
http://code.dayid.org/ppl/ppl.txt
Want more information about tmux and screen? Check out 
This page also
 | The formatting here is simple enough to understand (I would hope). ^  means ctrl+, so ^x is ctrl+x. M- means meta (generally left-alt or  escape)+, so M-x is left-alt+x | 
 | Action | tmux | screen | 
 | start a new session | tmux OR tmux new OR
 tmux new-session
 | screen | 
 | re-attach a detached session | tmux attach OR tmux attach-session
 | screen -r | 
 | re-attach an attached session (detaching it from elsewhere) | tmux attach -d OR tmux attach-session -d
 | screen -dr | 
 | re-attach an attached session (keeping it attached elsewhere) | tmux attach OR tmux attach-session
 | screen -x | 
 | detach from currently attached session | ^b d OR ^b :detach
 | ^a ^d OR ^a :detach
 | 
 | rename-window to newname | ^b ,  OR ^b :rename-window
 | ^a A | 
 | list windows | ^b w | ^a w | 
 | list windows in chooseable menu | 
 | ^a " | 
 | go to window # | ^b # | ^a # | 
 | go to last-active window | ^b l | ^a l | 
 | go to next window | ^b n | ^a n | 
 | go to previous window | ^b p | ^a p | 
 | see keybindings | ^b ? | ^a ? | 
 | list sessions | ^b s OR tmux ls OR
 tmux list-sessions
 | screen -ls | 
 | toggle visual bell | 
 | ^a ^g | 
 | create another shell | ^b c | ^a c | 
 | exit current shell | ^d | ^d | 
 | split pane horizontally | ^b " | 
 | 
 | split pane vertically | ^b % | 
 | 
 | switch to another pane | ^b o | 
 | 
 | kill the current pane | ^b x OR (logout/^D) | 
 | 
 | close other panes except the current one | ^b ! | 
 | 
 | swap location of panes | ^b ^o | 
 | 
  | show time | ^b t | 
 | 
  | show numeric values of panes | ^b q | 
 | 
Summary:
Ctrl-b c Create new window
Ctrl-b d Detach current client
Ctrl-b l Move to previously selected window
Ctrl-b n Move to the next window
Ctrl-b p Move to the previous window
Ctrl-b & Kill the current window
Ctrl-b , Rename the current window
Ctrl-b % Split the current window into two panes
Ctrl-b q Show pane numbers (used to switch between panes)
Ctrl-b o Switch to the next pane
Ctrl-b ? List all keybindings
Ctrl-b n (Move to the next window)
Ctrl-b p (Move to the previous window)
Ctrl-b l (Move to the previously selected window)
Ctrl-b w (List all windows / window numbers)
Ctrl-b  (Move to the specified window number, the default bindings are from 0 – 9)
Ctrl-b % (Split the window vertically)
Ctrl-b : “split-window” (Split window horizontally)
Ctrl-b : “break-pane” (Make pane its own window)
Ctrl-b o (Goto next pane)
Ctrl-b q (Show pane numbers, when the numbers show up type the key to goto that pane)
Ctrl-b { (Move the current pane left)
Ctrl-b } (Move the current pane right)
Ctrl-b : resize-pane (By default it resizes the current pane down)
Ctrl-b : resize-pane -U (Resizes the current pane upward)
Ctrl-b : resize-pane -L (Resizes the current pane left)
Ctrl-b : resize-pane -R (Resizes the current pane right)
Ctrl-b : resize-pane 20 (Resizes the current pane down by 20 cells)
Ctrl-b : resize-pane -U 20 (Resizes the current pane upward by 20 cells)
Ctrl-b : resize-pane -L 20 (Resizes the current pane left by 20 cells)
Ctrl-b : resize-pane -R 20 (Resizes the current pane right by 20 cells)
Ctrl-b : resize-pane -t 2 20 (Resizes the pane with the id of 2 down by 20 cells)
Ctrl-b : resize-pane -t -L 20 (Resizes the pane with the id of 2 left by 20 cells)
REFERENCES
http://dayid.org/os/notes/tm.html 
http://blog.hawkhost.com/2010/06/28/tmux-the-terminal-multiplexer/ 
http://wiki.frugalware.org/index.php/Tmux
Ctrl-b c Create new window
Ctrl-b d Detach current client
Ctrl-b l Move to previously selected window
Ctrl-b n Move to the next window
Ctrl-b p Move to the previous window
Ctrl-b & Kill the current window
Ctrl-b , Rename the current window
Ctrl-b % Split the current window into two panes
Ctrl-b q Show pane numbers (used to switch between panes)
Ctrl-b o Switch to the next pane
Ctrl-b ? List all keybindings
Ctrl-b n (Move to the next window)
Ctrl-b p (Move to the previous window)
Ctrl-b l (Move to the previously selected window)
Ctrl-b w (List all windows / window numbers)
Ctrl-b (Move to the specified window number, the default bindings are from 0 – 9)
Ctrl-b % (Split the window vertically)
Ctrl-b : “split-window” (Split window horizontally)
Ctrl-b : “break-pane” (Make pane its own window)
Ctrl-b o (Goto next pane)
Ctrl-b q (Show pane numbers, when the numbers show up type the key to goto that pane)
Ctrl-b { (Move the current pane left)
Ctrl-b } (Move the current pane right)
Ctrl-b : resize-pane (By default it resizes the current pane down)
Ctrl-b : resize-pane -U (Resizes the current pane upward)
Ctrl-b : resize-pane -L (Resizes the current pane left)
Ctrl-b : resize-pane -R (Resizes the current pane right)
Ctrl-b : resize-pane 20 (Resizes the current pane down by 20 cells)
Ctrl-b : resize-pane -U 20 (Resizes the current pane upward by 20 cells)
Ctrl-b : resize-pane -L 20 (Resizes the current pane left by 20 cells)
Ctrl-b : resize-pane -R 20 (Resizes the current pane right by 20 cells)
Ctrl-b : resize-pane -t 2 20 (Resizes the pane with the id of 2 down by 20 cells)
Ctrl-b : resize-pane -t -L 20 (Resizes the pane with the id of 2 left by 20 cells)