One thing I'm really impressed by is his inclusion of phrases into his art. People try to do this all the time, but I think he actually gets it right, using just the right words, in fun texts, and integrated well. I also love his collages, they are so colorful, and completely unique from the materials used in them. He does a great job of mixing blocky shapes of solid color with dreamy stardust looking designs. But especially, I just love the way he draws his characters, so fun and childish and kind of 50's looking.
Last year, he did a project of some sorts where he would post a piece of art every day, and he has some really great work there. Check it out, it definitely helped me get inspired when I was having artists block. http://www.cdryan.com/postings/01.08/01.08.htm