It depends on how motivated you are :) If you really want to learn not just Scheme but some really cool CS stuff, then SICP[1] is the best option. It's an awesome book, but it has about as much material as a single semester CS introductory course.
I learned Scheme (and a bunch of other stuff) with such a course and it was awesome. Most of my friends and I thought the course was easy but apparently others didn't, and I gather it actually has a reputation of being relatively difficult around here.
If you're less motivated or have less time, I've heard really good things about The Little Schemer[2]. Our course also suggested Simply Scheme as an introduction to it. This book was written by our professor, who is the best teacher I've ever had for anything, and it's available for free online[3], but I've never read it.
I don't know of any really good shorter tutorials, but I'm sure they exist. That said, if you have a little bit of time, you really should read SICP--you'll learn a ton about CS as well as learning Scheme.
[1]: http://mitpress.mit.edu/sicp/
I learned Scheme (and a bunch of other stuff) with such a course and it was awesome. Most of my friends and I thought the course was easy but apparently others didn't, and I gather it actually has a reputation of being relatively difficult around here.
If you're less motivated or have less time, I've heard really good things about The Little Schemer[2]. Our course also suggested Simply Scheme as an introduction to it. This book was written by our professor, who is the best teacher I've ever had for anything, and it's available for free online[3], but I've never read it.
[2]: http://www.ccs.neu.edu/home/matthias/BTLS/
[3]: http://www.cs.berkeley.edu/~bh/ss-toc2.html
I don't know of any really good shorter tutorials, but I'm sure they exist. That said, if you have a little bit of time, you really should read SICP--you'll learn a ton about CS as well as learning Scheme.