With the latest version of the Play store, there is a new tablet section, where you can see highlighted apps that feature tablet support. (laptopmag.com)
I haven't had time to get started on the Nook Tablet review yet, but you can find more info here on the Nook Tablet section of the blog, which includes a video review and first impressions post. (blog.the-ebook-reader.com)
When you go to the Market, you'll see a strip of featured apps along the top you can scroll through, and down below you'll see a specific Android Apps for Tablets section. (laptopmag.com)