Bird Listing Games
Bird listing  is a fun way to keep track of the birds seen in one's lifetime.  Unfortunately, it does not really do justice to denote the experience of the observer.  Current bird listing practice is almost exclusively done by species only.  Unusual bird plumage, behavior, etc. are not generally kept on such lists.  But, nonetheless, some type of listing is better than none.  Even a simple list of species seen each year for a favorite little spot of yours might prove to be invaluable some day in saving that land from imminent "progress".  Or maybe someone is doing research or writing a birdfinding book and you happen to be the only repository of knowledge for a particular spot. Who knows?  At any rate, you should keep lists for your own use. It will help you learn more about birds and about yourself.

Listers can be very competitive...or relaxed.  Neither approach is "wrong" unless it harms or hinders the birds, property, or people.  Listing is something that everyone should do...but, it should never become so burdensome as to make your birding experience bothersome.  Getting outside, observing, and enjoying birds should be your prime directive.  Listing is just a side dish...albeit a really enjoyable one to some folks.  (I suppose I have to include myself here. <grin>)
Life Lists
It's a list of all the species seen and identified by the observer in one's lifetime for a particular geographic region.  A birder can have life lists for world, continent, country, state/province, county (e.g. ANY defined boundary).  I keep life lists for world, continent, ABA (American Birding Association) Area, country,and U.S. States.  Additionally, I have county life lists for Maryland and Ohio.
Annual Lists
This is a list of species seen and identified by the observer in a specific area for a year.  Again, this could be by any defined region.  For the last few years, I have kept annual lists for county, state, country, and ABA Area.
More Fun Stuff
Life Monthly List:  the number of species seen in a particular month during one's lifetime
Annual Monthly List:  the number of species seen for every month of a year
Life Close-out:  a species seen in every county in a particular state
Annual Close-out:  a species seen in every county in a particular state in the same year
Life Monthly Close-out:  a species seen in every month of the year
Annual Monthly Close-out:  a species seen in every month of a particular year
County Century Club:  reaching 100 species for a county
Big Year:  an attempt to see as many species as possible in one year in a given region
Big Day:  an attempt to see as many species as possible in a 24-hrperiod