Traveling light and blogging about the journey?
There is a Colorado serial Web entrepreneur, Andrew Hyde, who sold all his possessions and took a year off of work to see the world. He decided to put everything into a single backpack. His laptop didn't fit in.
So his alternative was the iPad.
It is lighter, it is replaceable if stolen and the battery life is good.
In places with little or no Wi-Fi, this traveler visits Internet cafes to blog.
Using the free service Posterous.com he posted entries to his blog (built on Wordpress) and updates to his social media accounts (Twitter, Facebook, Flickr...). After copying and pasting the photos, he emailed flick+Facebook@posterous.com.
For longer posts, Andrew is using a bluetooth keyboard.
And by the way, if you wanna be totally cool I suggest you this case keyboard-ready on sale on Amazon. It is $99.