*NOTE* This addon only works for Classic WoW. Don't bother downloading the reail version which is super old.
This addon records all your honor kills (who you've killed and how many times). It also estimates honor gained by factoring in diminishing returns to give you an idea of honor gained for the day.
When inspecting players and checking their PvP statistics, this addon will record that data; when the same players are inspected two weeks in a row, the addon will display how much rank they've gained in order to give you some idea of how much honor is required to advance.
Battleground wins and losses are recorded along with various statistics: time of day, victors, duration, a "premade score" which is a rough guess as to how much of either side consists of a premade (ranges from 0 to 100), your killing blows, deaths and which character you played on. This data is displayed in a table with sortable columns and filters to display records with specified criteria.
The HKC window will open when you open your PvP window. (default key is 'h') Type /hkc for command line options.