You may have noticed the new charity banners on my sidebar. Whenever possible, I like to use the Internet and my computer to help me help charities I care about. Here are a few of the sites that I use to give with my time instead of my money.
Better the World is a new giving community. You can earn points towards cash donations to your favorite charity by visiting their website, filling out profiles, viewing ads, installing a browser toolbar, or by putting a widget on your website, social network profiles or blog (like the one to the right). You can generate lots of charitable donations for activities you do anyway.
Social vibe is a very similar concept. Donate to charity by installing sponsor messages on your websites or profiles, and by participating in the social community. Choose your cause and choose your sponsor. Some sponsors also give out "perks" but I have yet to get anything.
If you have more time, check out my list of Click to donate sites on squidoo with a great list of different ways to give to charity without spending money.
For more ways to give, check out A Time to Give at Saving and Giving.