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One well established way to get people to frequent your website or blog is to give things away or award prizes for a contest. People love getting things for free, especially when it is something of at least a little value.

Possible things you can give away (depends largely on your site niche):

A free link on your site.
A cash award paid through paypal.
An online gift card to Amazon or another place.
A physical gift like a free DVD or CD.

and, more!

Holding a fun contest can make your readers and visitors feel like they are more a part of a community when it comes to your site. Awarding a good prize will encourage word to spread about your contest. Take advantage of people’s liking of contests and freebies to increase traffic to your site.