The 1st way to pick up some quick cash is to write articles and sell them. The Internet is run by content. Every site out there is hungry for content. If you can put together an English sentence, you can write articles. The number of topics you can write on are virtually unlimited. All you need to do is concentrate on something that you're interested and write about 400 to 600 words on it, depending on the requirements of the site, and you can earn anywhere from $3 to $200 per article, depending on the demand for that topic and the site you write for. Most places will make payment within two weeks.
Another way to earn some quick cash online is to freelance at a place like Elance.com. Depending on what your skill is, you can make a quick killing by outsourcing yourself out to somebody looking for something to be done. Maybe you're a programmer. You can offer to do a simple programming job for somebody looking for a simple job. Maybe your skill is proofreading. If somebody is looking for a person to proofread their manuscript, you can make a quick few bucks doing that. Payment can be made to your PayPal account and again, just like with Ebay, you can have that money in your bank account within a few business days.