In today's economy, it is important to tighten the old frugal belt, and look for other forms of income. There are many ways to make a little extra cash on the weekends, it just takes a some ingenuity. The key to side businesses is to keep it simple. Let me say that again "Keep it simple." If you enjoy jogging, become a dog walker. If you get along well with kids, try babysitting. If you are into yoga, try teaching a class at the local park. If you are fond of cooking, try catering a small party. If you are an artist, try selling some pieces. Basically take whatever you like to do on the weekends, and see if you can make a buck doing it. Remember, you have a regular job, so don't over do it by burning yourself out.
As for myself, I enjoy wood working and home improvement. I live in a new housing development. When we first moved in, a few months back, I installed my own window blinds, and saved a lot of money with minimal effort. Now, every time someone new moves in, I pass out flyers offering to install their window blinds for a nominal fee.
Any money earned in a side job is a bonus, and equally money earned, is not money spent.