If you got hooked by Borders' Cruz reader, I guess you will like Pocketbook IQ more. (which I ordered and am waiting for receiving...)
Pocketbook IQ has the same hardware as Cruz Reader. and I guess cheaper. ($149 in the USA) It will be equipped with Pocketbook's reader app.
http://www.the-ebook-reader.com/pocketbook-iq.html
You can check out the spec there.
About your question... you need to look up Pocketbook forum to see how to achieve apps for these android tablets.