Although Data Entry jobs are very popular, there's not really a lot of (legitimate) options out there. There are a couple of companies who regularly offer data entry tasks online for extra money. There's not always work available, but when there is, it is an easy way to make a few extra bucks here and there.
DionData Solutions You must download and fill out their application to be considered. They have projects available nationwide for remote workers as well as some in-office positions too.
Virtual Bee The Smart Crowd The Smart Crowd, formerly Virtual Bee, will pay you to key little snippets of information. Payments are made twice a month via Dwolla as long as you have met the minimum payment threshold ($30.00).