I usually use my laptop when I'm blogging but for this post and the one before this I've been experimenting with using MaStory. MaStory has some really great features among them are great integration with Blogger, Wordpress, Livejournal, Drupal, Pixelpipe, Flickr and Picasa. But also support for a lot of HTML code and very advanced posting options. The only thing that I personally miss from MaStory is spell- and grammar-check.
MaStory for me means that I can work on my blog posts whereever I am, and I do not need my laptop for blogging anymore - that's a great freedom.
One problem that I have found though is that when I add pictures straight from MaStory they are way too big for my layout here on blogger.