Be careful when you enter online contests. Make sure you read the contest rules, most of the time you end up transfering ownership of your work to the website or company running the contest for them to use/sell/do whatever they want without any compensation even if you do not win or place.
Every year my local newspaper would run a contest and give away new P&S cameras to the weekly winner and a new dSLR to the overall winner. I entered a few years in a row, but I could not compete with the hordes of cute baby/toddler entries.