The Autosave module automatically saves a snapshot of your content type form using AJAX. If the user's browser or machine dies while editing a node; the edits will be presented to the user the next time they return to the node. The user may toggle back and forth between the last saved version and the version with the edits that were lost and select which of these they would like to continue with.
How often a form is autosaved as well as which content types to enable autosave for are admin configurable.
This module creates a menu bar that is displayed at the top of every page. The menu bar is fixed in place and uses jQuery to position the bar, along with handling menu effects and adding IE compatibility.
Very useful for themes that don't have a good place to put the navigation menu (although it can be used with any menu.)
This module creates a cached version of each block. Block caching happens separately from page caching and so it will work for logged-in users whether or not page caching is enabled for the site.