Most birders keep some sort of list. Whether it is the birds they've seen that year, in that county, on that patch of land, or in their entire lives, lists are a useful way of keeping some focus on your birding.
They also inject a bit of competitive spirit in the proceedings, even if you are only competing against yourself (cheating, in this case, would of course be desperately sad). Some birders do take listing further with the concept of bird races, competing to see who can see the most birds in a day / weekend / year.
I generally keep the following lists, all of which can be found on The Hornet's Nest. None are very impressive by serious birder standards, but then I'm not a very serious birder.
Click to view my: