Seven Samurai Skirmish is a set of free wargames rules for battles in the spirit of the classic Kurosawa movie Seven Samurai.
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Craig Grady offers a set of Samurai Skirmish Rules
Warlord Games offers a free pdf of their Samurai game, Test of Honour.
An Honorable Victory is a set of free wargames rules for battles set in Japan's 15th and 16th century clan wars. The author writes:
An Honourable Victory! are an abstract (but not too abstract) set of rules designed for the table-top wargaming of the Clan Wars of Japan during the 15th and 16th centuries.
After one or two games you'll have them down pat.