the Hareeb,

I-797 (original), passport, and visa application receipt (you get from Nabil bank) : technically,  these three documents are required at  US embassy for H1b visa interview.

Other than that, the more additional documents you can have, the more credibility you will gain to get visa granted. So, the rest of documents are just to add extra support...

What can be these extra documents -

1. Employer's letter (that you work and get paid and your future prospectus is good with that company).
2. Tax records (shows you are good guy for US government).
3. Past pay stubs copies (oh.. yeah, you are indeed employed).
4. Client's letter (now, you really wanna prove - there is no doubt about your employment... you really work at this company location)
5. Add whatever documents you want in the list (your academic documents, your work id card, driving license, insurance copy etc etc.. )

I hope this helps..