MarsEdit is my blogging client of choice, and I like to use it both on my MacPro and MacBook Pro. This can be achieved by using Dropbox.
On the machine you currently use for MarsEdit, paste the following commands into a terminal window. Make sure you quit MarsEdit first if its running.
On the other machines you wish to use MarsEdit with, paste the following commands into a terminal window. Make sure you quit MarsEdit first if its running.
That's it!