Just installed WordPress for Android on my new Nexus 7 tablet, and I have to say, it works great! Doing this post from the couch using WiFi and this interface is very well built.
One note, you need to enable Remote Publishing on your site for it to work. Just go to Settings > Writing, look for Remote Publishing on the page and check XML-RPC. Remember to save setting and you should be all set.
Now if only Adobe would get their Touch Apps working on a 7in tablet!
Check out their apps and maybe let them know you think the Nexus 7 would be a great addition to their supported platforms!