I have participated in a couple of online "quilt-alongs" where there was a tutorial for a particular block or phase of the quilt process and a set amount of time- usually about 2 weeks. Everyone participating posted pics of their progress on a flickr group. It was a lot of fun and encouraging too- to see all the variations of the "same" quilt.
I was able to do my first FMQ on a whole quilt this way.
That group was sponsored by Old Red Barn blog-they are taking a break right now until January when they will start a new scrappy quilt along.
Bonnie Hunter at Quiltville.com is also starting a scrappy mystery quilt this Friday with directions posted every week or so. I am looking forward to doing this one.There is a Yahoo group to follow this mystery.
But some of the best ones are right here on the board-more are block swaps, but the tutorials are like an online quilting group as those following along post their progress. Since quilting is often a very solitary hobby, this is a fun way to socialize without having to go out! Works for me!