Sefer Vayikra has lots of laws in it, and then it closes with an appropriate conclusion, namely, the story of what happens to Israel if it chooses to follow those laws, or if (ח"ו) Israel strays from God's laws. The final verse appears to be a coda for the book of Vayikra as a whole (26:46):
אֵלֶּה הַחֻקִּים וְהַמִּשְׁפָּטִים וְהַתּוֹרֹת אֲשֶׁר נָתַן ה' בֵּינוֹ וּבֵין בְּנֵי יִשְׂרָאֵל--בְּהַר סִינַי בְּיַד-מֹשֶׁה
These are the laws, rules, and instructions that the LORD established, through Moses on Mount Sinai, between Himself and the Israelite people.
But wait! We're not done! Although I was about to put away my Chumash thinking that this must be the conclusion, all of the sudden I see that God speaks to Moshe again to tell him about the laws of dedications, some extra details about how to evaluate certain items one might want to dedicate to God and ramifications of those laws regarding land and such.
What is this passage doing here? Did we have to throw in some details that were forgotten in previous passages? Why would these laws be taught after what otherwise seems like a very logical conclusion to the Sefer?