OnSwipe. It's so miserably executed, so misunderstanding of the iPad's fundamental interaction metaphors, so... unutterably awful.
OnSwipe. Alas, there does not seem to be a way for end-users to disable it across all blogs?
Since I don't have an iPad (or any tablet device) I opened it up in the simulator. At first glance, I felt it was fine. Clean, readable. Don't see a problem. But viewing the homepage and navigating onward was a real 'ugh' moment.
I understand why wordpress bloggers install plugins like wptouch. Small screens and all that but why the iPad?
The bloggers typically don't install OnSwipe, or even know that it is there. That's Wordpress.com's doing. By default on all Wordpress.com blogs, if your visitor is on an iPad then the OnSwipe theme replaces the theme you chose for your blog. As far as I can see, there's nothing that makes it obvious to the blog owner when they pick their theme that it is being overridden on iPad.
If the blog owner somehow becomes aware of it, there is a setting in their blog control panel that lets them turn it off.