This week's and next week's parshiot deal with the Ketoret (incense) that was brought twice daily in the Beit Hamikdash.
Rav Pinhas Zvihi has a great book on the Ketoret called Mizahav Umipaz, that I study regularly. It's in numerous languages (including English, but I only found the Spanish version online). It talks about the laws of the Ketoret, has an explanation of the Pitum Haketoret that we say 3 times daily, and goes into great detail of the benefits of the Ketoret even in our days.
Also, here's an interesting article on the Ketoret.