In addition to a number of bugfixes and the inclusion of the GPLv2 license directly (per request for something Debian-packageable), crossposting ability for all supported APIs, and support for blog keyword tags (the mt_keyword field supported by Movable Type and Wordpress), the new version has three significant features.
Second, you can now have arbitrary post templates. Specify a template on the command line or in your .charmrc file, or load it manually before posting, and your post's meta-info (subject, picture, mood, community, etc., whatever you want) and post body will be pre-populated accordingly. Templates look exactly like archive files, so you can easily turn an archived post into a template. You can always override the contents of a template with command-line options or via the regular posting menu.
Third, if you're using MetaWeb API blog software like Wordpress, you can now automatically add a social bookmark to your posts. Currently, the supported service is AddThis, but I'm willing to add support for other services and general configurability as they're suggested.