Online is much less expensive for one thing. If you go check it out at pretend like you're going to sign up (do everything but enter your payment information) and then go a page back like you're going to leave and there should be a popup offering you an even cheaper rate. In my area, it's $30 to sign up and $10 a week until week 9 when it goes to $8. Online I got 3 months for $60 and then it will be $16.95 a month after that.
Anyway, in person you get a Pointsfinder sliderule and introductory printed materials. After that, everything is extra but you don't sign a contract so you could go sign up, get your sliderule and an instructional lesson on the program and then do it on your own or keep going if you want of course. I like the meetings, but can't justify the cost right now.
Online, you get instruction and a really cool food and exercise tracker. You can search for foods and it will tell you how many Points it is. You can print out a blank journal or plan all your food for the day and print that out. You can enter recipe ingredients for your favorite recipe and it will calculate the Points per serving for you. You can also order printed materials on the site.
Edited to add that there is a great list of foods here on 3FC that gives you all the nutrition info plus Points. Interesting stuff there (seal blubber anyone?)
