Lots of my clients ask me what they should blog about, and also ways to monetise their sites. Years ago I was recommended this great site http://www.responsesource.com/ The site is set up for PRs, businesses & organisations
who are looking to get more coverage opportunities for their clients, which basically means, people who are looking for you to advertise their clients product or brand.
You simply sign up, describe what sort of site you own, and the types of content you are interested in, they send out items to review, which you could then use for prizes on your blog, or keep! all you have to do is review said item on your site and share it with all your readers, so its a win win situation really
If you take my lead and use the site I would love to hear how you found it, or maybe if you have used it before, or of any other sites such as this that you would like to recommend.