I think I've been dealing with my experimental comic The Traveling Sketchbook for 4 or 5 years. I'll often mail it out, forget that it's in another city, then remember, track it down and have it mailed again. In fact I think it's been a year since I've even seen it live. There's also a list of artist wanting to draw in the book, if they haven't forgotten about it by now.
I also tend to neglect the blog I've set up for the pages already created inside. But, not today. Today my daughter, Lily, went to bed early and I'm updating The Traveling Sketchbook!