Minimizes the comment list and turns the comments title (eg. "3 Comments") into a trigger to view/hide the comments.
Requires no template hacking, only a knowledge of CSS selectors:
The comments are usually inside a list with a class of ".commentlist" so you probably won't need to change the option for the "contents".
The comments title however may be different on your theme so you may have to change the "trigger" option to something different than the "#comments-title" id. Use "Inspect element" on your post's page to deterime the correct class or id of the element you want to be the trigger.