Ratpoison is a great minimalist window manager, very light-weight and very fast. It opens all windows in fullscreen mode, which is mostly fine but doesn't work that well with some applications that use multiple windows (GIMP!) or with the dialogue "pop-up" boxes that some apps have. Still, ratpoison is simply great! In case someone wants to try it, I'll give you here the basic in-built keybindings to get you started with ratpoison:
RATPOISON'S KEYBINDINGS:
-- enter a ratpoison's internal command: "Ctrl-t :"
-- enter a shell command: "Ctrl-t !"
-- open a terminal window: "Ctrl-t c"
-- info about all open windows: "Ctrl-t w"
-- info about the currently active window: "Ctrl-t i"
-- activate an opened window number n (n=0-9): "Ctrl-t n"
-- activate the next window: "Ctrl-t n"
-- activate the previous window: "Ctrl-t p"
-- flip back and forth between two windows: "Ctrl-t Ctrl-t"
-- split frame horizontally (into two windows, one on top of the other): "Ctrl-t s"
-- split frame vertically (into two windows, side by side): "Ctrl-t S"
-- maximize the active window: "Ctrl-t Q"
-- close the active window: "Ctrl-t k"
-- kill the active window (in case it refuses to close): "Ctrl-t K"
-- display time: "Ctrl-t a"
-- maximize the currently active window: "Ctrl-t l"
-- indicate which is the current frame: "Ctrl-t f"
-- cycle through frames: "Ctrl-t tab"
-- switch to the last focused frame: "Ctrl-t Alt-tab"
-- kill all frames except the current one: "Ctrl-t Q"
-- kill the current frame: "Ctrl-t R"
RATPOISON'S INTERNAL COMMANDS:
-- exit your ratpoison session: "quit"
When you press the "Ctrl" and "t" keys simultaneously, the cursor turns into a white square. Then you press some other key to complete the command. Pressing the "Esc" (Escape) key cancels the command. Very simple, very convenient. Please give it a try!
There's also a ratmenu (a simple ncurses Debian menu based on 9menu) and other stuff available. Read the man page for more info. Here's the ratpoison web page:
http://www.nongnu.org/ratpoison/ and here's the ratpoison wiki:
http://ratpoison.elektrubadur.se/