Placeholder for more useful help text later -- just here to keep my notes intact.
{{
keyword list;
header: Header Line;
noheader: If specified, there will not be a header line
nonew: if specified, there will not be a + to add a new page
newtitle: If specified, will be the title of a new page
newpage: If specified, will be the caption at the top of the new page editor
new: If specified, creates a full text link to add a new page (with given text)
template: If specified, items will use template matching "Special:Link (given text)"
limit: limits number of items listed. really useful only with time sort
sort: title, created, or modified
flow: specifies that items should be comma separated like the [[ ]] style list.
ifheader: Will not draw a header IF there are no items to show. Makes the list invisible if it isn't needed.
}}
This needs explained.
You can actually put anything before a colon in a list option. All of these values are made available to templates that are drawing the list by using the format $$variablename$$.