In alphabetical order:
Atheism: I particularly love Carl Sagan, and I find his own love of exploration and humility regarding human knowledge inspiring. Intellectual honesty and rigor are important elements to a well-examined life, for those who have the wherewithal to apply them. Prof. Sagan embodied these virtues. More generally, I think people could do with a better balance between skepticism and credulity -- and people tend to be credulous toward the people and groups that tickle their ears the most. Typically, atheism is marked by an adherence to skepticism as an approach to acquiring knowledge, and this is an important lesson for the more credulous.
Buddhism: I would cite the Dalai Lama as my prime example of inspirational Buddhists. He is tenacious in hope and compassion, and most certainly worthy of emulation. (As a side note: he also happens to be close friends with Desmond Tutu, who is one of my favorite people -- so, kudos) Generally, I find the 8-Fold Path to Enlightenment highly virtuous and the notion of Interdependence Rising a useful hold against excesses and abuse of the people and world around us.
Islam: It is my own ignorance that keeps me from identifying a famous individual to hold up as an inspiration from Islam. I can talk about my roommate from grad school, though, and cite him, personally, as a model of someone dedicated to rigorous adherence to principle in the face of a society that doesn't generally understand his way of life. I remember him getting up in the wee hours of the morning to pray; he decided to eat only Halal meat which made him effectively a pescetarian -- a hard thing for him, but about which he never complained; and he was exceedingly generous. His mom would send him food from Bahrain -- a taste of home -- and he was quick to share with me. Generally, the kindness combined with personal conviction and adherence sets a high bar for measuring integrity. This is a kind of integrity that I wish I could see more often, but rarely do; and it serves as a reminder for me and my own life.
Judaism: Eli Weisel is a prominent voice for some of the things I find most compelling in Judaism, today: Tolerance, mutual respect and peace, and the commitment to a serious inner spirituality. I don't agree with his position on Israeli settlements, but generally, he brings light to oppression and genocide when most of the world finds it inconvenient to see it. As a Christian, myself, I love the Law, the Psalms, and the Prophets. I am singularly impressed with how even the explicitly-identified godly patriarchs are not whitewashed, and their vices and excesses are not denied or justified as tolerable. And I love that God is consistently portrayed as One on the side of the voiceless -- He hears the voices of those who nobody else can hear.