The Rema (OC 296:1) writes that after drinking from the Kos of Havdala you pour the wine on the Havdala candle to extinguish it and then wash your eyes with the spilled wine to show love for the Mitzva.
The Minhag Yisroel Torah brings a number of Minhagim performed with the wine. The Shela says that when you wash your eyes you should say the pasuk "Mitzvas Hashem Bara Meiras Einayim". He brings from the Chasam Sofer a minhag to not only wipe the wine across your eyes but also your forehead. The Emek Bracha says to wash your face with the wine.
Regarding the minhag of dipping your pinky finger in the wine and touching your pockets, the Sefer Toldos Shmuel says he know no source for it. But nevertheless he concedes that he has witnessed this by people who are Midakdek in Mitzvos. He even testifies that the son of the Likutei Mahariach would put wine in every pocket he could find. But no where does he mention anything about getting rich.
For segulos, Rav Yaakov Emden, says that smelling the extinguished candle will save you from bad smells during the week. To be spared from evil during the week the Sefer Zechirah says to look at your forehead in the reflection of the wine after Havdala and say three times "Ki Ra'isi Elokim Panim B'Fanim VaTinatzel Nafshi." To avoid fires relight the havdala once again after havdala, according to Rav Zalman Boniat.
Acharon Acharon Chaviv, it is brought from Rav Menachem Mendel of Rimanov that if you want a segula for Parnasa you will need to have the patience to say Viyiten Licha together with another person. Ah Guteh Voch!
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