Last command executed:

put(msg) writes simple text to the console:

filter used for keys() and keys() below. For dump() filters can be nested; one filter for each recursion level (not shown here).
Sort: None Ascending (default) Descending
Show functions
Write regular expressions to match property names against (example: /^[a-z]/):
Include:
Exclude:
Limit: (default=no limit (0))

dump(label, data, recurse, filter) dumps a data structure to the console, with data type indicators, and with configurable recursion, sorting and filtering (configure above).
Recursion level: 0 1 (default) 2 3
Dump some builtin's: window window.location window.navigator document document.body document.forms
Dump something else:

keys(label, data, filter) is like dump, except it only dumps the keys, not the values, and is not recursive. Uses the filters above ("recursion level" and "show functions" are ignored).
Show some builtins' keys: window window.location window.navigator document document.body document.forms
Show some other keys:

dom() dumps a DOM/XML tree structure, as markup rather than as a JS data structure. Pretty basic, no options or filters.
Show some DOM hierarchy: document document.body
Show some other hierarchy: