I try to keep track of yearlists through the year on a notepad that I keep in my pocket but it always ends up forgotten by May . At the moment I'm just kind of ignoring my past sightings and trusting my eBird yearlists since I've been using it more. If I really want to know, however, I'll just take the ABA bird list and write out all the ones I've seen for life, year, yard, or "patch"... but the list ends up getting thrown away randomly later, so I guess I could say I don't really list that much. I do like to know roughly where I'm at though. I have used word documents in the past, but I find them bulky and hard to keep track of. I did recently get the sibley book that lets you keep track of "first seen" dates, and I've been pretty faithful with that. Would highly recommend it: Sibley Lifelist Book
I'm extremely proud of my yard, to a fault, so yes I keep yardlists . I think it's important because even though travelling is fun, there's something special about seeing something right at home (like the GGOW that randomly showed up at my back door on this Thanksgiving).