Many companies match donations and/or volunteer time given to non-profit organizations. There are many organizations that do this (including the Bill and Melinda Gates Foundation, Verizon, Starbucks, Boeing, etc.), so be sure to check with your employer!
If you are interested in having your donations matched, simply ask your HR department if your company matches donations to non-profits. If they do, they'll most likely have a form for you to complete and will let you know how it works for your individual organization. Then all you have to do is give, then sit back and watch your generosity GROW!