For an excellent overview, see Jewish Calendar from Judaism 101. Also, you might see Yahoo!’s Judaism Resources: Calendars page.
The Orthodox Union also lists Shabbat and Holiday Candle Lighting Times for both American and international cities, as well as a Jewish Holidays website.
If you’re looking for more than just candle-lighting times, check out Kashrut.com’s Zemanim (prayer time) Service. They can compute Alos HaShachar, Sunrise, Sunset, Sof Zeman K’rea Sh’ma, Plag HaMincha, Tzait hakochavim, etc.
For links to other Jewish Holidays sites, see Yahoo! Jewish Holidays.