Tom,
Every year around Passover, Columbia University's christian fellowships holds a "Jesus Week" rally, which usually consists of a Gospel Video Presentation, Praise on the Steps, a Coffeehouse, and a Testimony night. Of these 4, I've always found Praise on the Steps to be the most effective in reaching out. Several reasons:
1) Location: we hold a kind of concert in the dead center of campus. Everyone stops by.
2) Music: everyone can appreciate live music.
3) Atmosphere: the steps are known as the general chill-out place at Columbia, so we make sure that it's more intimate than a concert.
4) E-teams: this is probably the most important part. We got 20 people to commit to doing nothing but outreach that night, since christians tend to clump and do nothing at events like these. We trained up these 20 people in the 4 spiritual law booklets, surveys, or just general conversation starting skills.
Hundreds of people were reached out to, many gospel presentations were made, and I personally saw someone come to Christ that night. I was amazed at how many people were reached out to in 3 hours by 20 people.
This worked REALLY well at Columbia ... who knows, your campus, school, area, neighborhood, what have you, may be different. A coffeehouse might work better, as people might be attracted to food and performances. It probably depends on who you're reaching out to.
Anyone know of any Christian coffeehouses or festivals and concert venues that reach out to pre-Christians? 
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