WordPress Edit and update your blog from the app - also comment moderation!
Picasa Photo Albums If you use Picasa to manage your photos, this is an easy way to get access to those photos from your iPad, save an image, then attach it to a blog post.
Wi-Fi Finder This app tells you where the wi-fi is near you, in case you want to move your blog office from one place to another.
Note: requires that you're either already ON wi-fi or have a 3G enabled iPad in order to use it.
Twitter Share your blog posts once you've posted them!