Distinguishable Website Feature

[Steve09]

I'm going to be making a Online Second Hand Book Store for Students at my University (Not real, it's my final year project) but as a couple of Students could be doing this project (With different supervisors to mine) what feature could I implement to make my Website distinguishable from theirs?

So far I've thought of a news feature page which has general information for Students at my University (Not book related at all)

Do you have any ideas? I'm using HTML with PHP/MySQL.
Thanks

 

[Steve09]

Thanks for the ideas fini and AJK.
I'm liking the sound of lots of user generated content, which I think is a good and useful idea and I'll more than likely create a questionnaire to hand out in one of my lessons to a few people right at the start of term.
Thanks