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+==================
+Scheme
+==================
+
+``mit-scheme`` with the ``scmutils`` package is assumed; the command 
+``mechanics`` starts in interactive edwin prompt. 
+
+See also notes on `The Little Schemer </k/books/littleschemer/>`__.
+
+Scheme Implementations
+-----------------------
+
+Very partial list, mostly just the ones which are interesting to me.
+
+MIT/GNU Scheme
+    The 7.9.0 release (last stable as of 01/01/2009) is not R5RS compatible,
+    and is generally a pain in the ass to compile on new systems. The 9.0
+    release should be easier to compile and distribute because it will use
+    a C compiler to bootstrap (true?).
+
+SCM
+    SCM is a fairly minimal, very small footprint R5RS-compatible 
+    implementation. Apparently very portable and easy to compile. Includes
+    the Hobbit compiler. Part of the GNU project, maintained at MIT?
+
+SIOD
+    SIOD (scheme in one day) is a super small (75k binary?) Scheme 
+    implementation.
+
+Coding in ``edwin``
+-----------------------
+
+..note: this section should be spun off as emacs. edwin is essentially a 
+    scheme version of emacs. See this 
+    `http://static.bryannewbold.com/mirror/sheets/emacs.pdf`:emacs cheatsheet:
+
+Common keyboard commands (usually 'M' is alt button, 'C' is ctrl, and 'S' is 
+meta/super/"windows"):
+
+=========   ====================================================================
+C-x C-f     Open a file, or create a new one
+C-x C-s     Save the file
+C-x k       Kill (close) a buffer
+C-x C-c     Exit the editor
+C-g         Abort a command
+C-x C-e     Evaluate the previous expression
+M-z         Evaluate the surrounding expression
+M-o         Evaluate the entire buffer (everything)
+C-c C-c     Kill evaluation after an error
+C-y         Paste (yank)
+C-x 2       Split screen vertically
+C-x 5       Split screen horizontally
+C-x o       Switch to next buffer window
+C-x 1       Return to non-split screen
+M-x         Enter a command by name in minibuffer (use tab to complete)
+C-x C-b     Show buffer menu
+C-x b       Select buffer
+C-x u       Undo
+C-y         Paste
+=========   ====================================================================
+
+Scope
+--------------
+
+``set!`` looks up a symbol name and permanently changes the first value it comes
+across. ``let`` (and ``letrec``) create a new symbol with the given value.
+But wait, you need a ``lambda`` block to make everything work?