There are lots of off page activities,
1. Social Bookmarking (Create your business a/c on social websites, like facebook, linkdin, twitter etc. and continue update your product and services)
2. Bookmarking.
3. Blog Posting (create your blogs and get comments)
4. RSS Feed (Summit your RSS feed)
5. Article submission
6. PDF Submission
7. Forum Posting.
Continue with this activities with patience you will definitely get result.
I you have any points please ask me...