SEO for website, what niches would this site serve?

[Charlie]

I have been developing my website for the past two years, I am happy with the design, but not sure where to go now. The site is (http://www.)theonlinecity(.co.uk) - its current focus is voucher codes but I would like to move away from this if possible, any ideas what articles I can write about, what market would better suite for it? I

[Jake]

Since your already catering to discount seekers, you might review these other sites, all big enough to rent ad network banner space, for other freebie/bargain seeker topics.
(Happended to run across these doing some advertising research)
lifescript.com
dealio.la
sampleville.com
freetrialadvisor.com
FreebiesFrenzy.com
freesamplesinthemail.net
sampleville.com
Skincarebeautytrials.com
a2xanxiety.com
http://www.us.coloplast.com
qualityhealth.com
getitfree.us