I have been doing online surveys this year- you won't get rich, but it's a very easy way to make some spending money. The two I use are reputable:
Your2Cents- I have earned $60 dollars so far with no trouble. You need to answer short surveys they email to you. I suggest using a "junk" email account like yahoo or gmail. You can also sign up to do surveys by cell phone. They send you a check in the mail each time you reach $10 in rewards. You earn between $1 and $5 per survey.
The other is Pinecone Research- it's a little trickier to sign up for as you have to find a referral site. I have not made as much money off Pinecone- but they do offer PayPal as a way to receive your money from them. They sometimes also offer products for you to try at home.
One site I absolutely DO NOT recommend is Phonehog. I will not even post a link to them. They offer free long distance minutes for filling out email offers- but they send you a TON of unsolicitated emails. I don't like them at all.
One last idea is selling used books, video games, CD's, and DVD's on Half.com which is an Ebay company. It's very easy to do- all you need is the product ISBN or UPC number. I like it better than Ebay because your item stays listed like a store until it sells. You can also put your account on vacation if you are going to be away. We have made several hundred dollars over the years with Half.com.