The TouchPad, though a little undercooked, has a few impressive apps on their platform already. WordPress for webOS, for example, uses the sliding panels motif to create a highly flexible blogging interface. It's everything you'd want in a WordPress app.
The sliding panels is straight out the Twitter for iPad playbook, you can see new screens quickly and manage all your comments, drafts, posts and pages from one screen. It also has a visual text editor so you can bold or italicise or underline the good stuff. [HP App Catalog via Wordpress]