Extensive modifications to overview.md.

I tried to add clarity and details while maintaining the spirit of the original
document. However, it might be a bit too 'dry' now. I'd be happy to liven it up
a bit. I'm only serious when I feel like I _have_ to be.

One of my opinions (which may be at odds with yours) is that the documentation
should emphasize `jrnl`'s advantages without downplaying any other existing
solutions.

If I have time, I'd like to add more information about the documented benefits
of journaling, particularly the mental health aspects. That will probably need
its own page, but I'm new here, so I don't want to overstay my welcome. :)

docs/overview.md

@@ -1,27 +1,44 @@
 # Overview
 
-## What is jrnl?
+## What is `jrnl`?
 
-`jrnl` is a simple journal application for
+`jrnl` is a simple but powerful plain text journal application for the command
-your command line. Journals are stored as human readable plain text
+line.
-files - you can put them into a Dropbox folder for instant syncing and
-you can be assured that your journal will still be readable in 2050,
-when all your fancy iPad journal applications will long be forgotten.
 
-Optionally, your journal can be encrypted using the [256-bit
+`jrnl` is not the only plain text journal application. It includes features that
-AES](http://en.wikipedia.org/wiki/Advanced_Encryption_Standard).
+are common to many other applications:
+
+- Journal entries are created and displayed directly from the command line.
+- Journals are stored as human-readable, future-proof plain text files. Because
+  files are stored as plain text, you can rest assured that your journals will
+  still be readable in 2050 and beyond. Entries can be searched, filtered, and
+  edited rapidly and easily.
+- Journals can be stored anywhere, including in shared folders so that they can
+  be synchronized between devices.
+- Journal entries can be created and modified using an external editor of your
+  choice, using the command line as a starting point to filter specific entries.
+- BeJournals are stored in single files using date/time tags to identify
+  individual entries. Some systems endorse a file/folder methodology; `jrnl`
+  keeps 
+- Journals can be protected using [256-bit
+  AES encryption](http://en.wikipedia.org/wiki/Advanced_Encryption_Standard).
 
 ## Why keep a journal?
 
-Journals aren't just for people who have too much
+Journals aren't just for people who have too much time on their summer vacation.
-time on their summer vacation. A journal helps you to keep track of the
+Journals help you keep track of events, thoughts, feelings, tasks, ideas, and
-things you get done and how you did them. Your imagination may be
+anything else that is worth remembering. Your imagination may be limitless, but
-limitless, but your memory isn't.
+your memory probably isn't.
 
-For personal use, make it a good habit to write at least 20 words a day.
+To begin, try to write at least 20 words a day. `jrnl` makes this incredibly
-Just to reflect what made this day special, why you haven't wasted it.
+easy. Fire up a terminal and type, `jrnl today at 8am: I arrived at work to find
+a birthday present on my desk. My colleagues are the best!` You can reflect on
+what made your day special so that you'll always remember why you haven't wasted
+it. Or try using `jrnl` to keep a gratitude journal, a habit that has been shown
+to improve mental health and quality of life.
 
-For professional use, consider a text-based journal to be the perfect
+For professional use, a text-based journal can be the perfect complement to your
-complement to your GTD todo list - a documentation of what and how
+to-do list -- a record of what you've done as well as how and when you've done
-you've done it. Or use it as a quick way to keep a change log. Or use it
+it. You can use a journal as a quick way to keep a change log (`jrnl Updated
-to keep a lab book.
+jrnl overview page to make it more awesomer`). Or use it to keep a lab notebook.
+The possibilities are almost endless.