They range from finished illustrations, a number of which are for Wired, through complex Moleskein drawings to simple but charming doodles.
He has recently collected a variety of them into a book titled The first in line.
He has stuffed a lot of drawings and illustrations into the 160-page book, judging from the video flip-through on his site, which gives a good idea of the range and scope of the contents. There is also a picture of the cover here, and more info here.
If you order before June 1, Adolfsson will sign your copy and include a small doodle.