My typical workflow for publishing an entry in Movable Type consists of writing and publishing the entry to a Sandbox weblog, checking that it contains no spelling, grammatical or styling issues and then transferring it to my main blogs. Suffice to say, this is a fairly time consuming method as some error always occurs during the transferring process. Hence, this weekend, I sat down and wrote a plugin that would save me all this trouble.
In fact to better demonstrate this plugin, I've created a screencast which can be viewed here (excuse the 3MB size - my video skills are near non-existent!). LivePreview is a free plugin, if however you find this useful, please consider donating $5 if you're a personal user or $20 if you're a commercial user.