Why is Hashem called "Go'alchem"?
Radak: He redeems you from Galus Bavel.
What does "Kedosh Yisrael" refer to?
Radak: Yisrael your ancestor. Hashem before them in their Galus in his merit - "v'Zacharti Es Brisi Yakov" (Vayikra 26:42)
What did Hashem send to Bavel?
Rashi #1, citing Targum Yonasan: Due to your sins, I exiled you to Bavel.
Rashi #2: This refers to tidings of the Ge'ulah. I will send the kings of Madai to Bavel with boats and rudders, to exile [Bavel] to Madai.
Radak: I sent Koresh to Bavel to destroy it and take you out of it, and return you to your land.
Ibn Ezra: I come to redeem you so quickly, it is as if I was sent 1 to Bavel.
Ibn Ezra citing a Chacham:Hashem speaks to the Navi. The Sar of Yisrael 2 was sen t to Bavel to redeem Yisrael. Radak - I have a tradition that it is read Shilachti with a Chirik. Targum Yonasan understood so, just he explains that Hashem sent Yisrael. Chazal understood that it is Shulachti; they expounded that wherever Yisrael was exiled, the Shechinah was with them (Megilah 29a). Also when they were exiled to Eilam, "v'Samti Kis'i b'Eilam" (Yirmeyah 49:38).
Radak: He explains as if it says Shulachti. This is astounding!
Presumably, this refers to Micha'el, who is called "Sarchem" (Daniel 10:21).
What is the meaning of "v'Horadti Varichim Kulam"?
Rashi, Targum Yonasan: I made them all descend with rudders.
Radak #1: I will lower Bnei Bavel from their level, v'Yivrechu (they will flee) when Koresh comes. Varichim is an adjective (fleers).
Radak #2: Varichim means in boats. The Veis is a prefix; Richim are boats that go in the Ru'ach (wind).
Malbim: I felled Bavel's fortresses and exiled them in boats, in order to redeem you from there.
What does the verse teach about Kasdim?
Rashi #1: They took you in boats of their song.
Rashi #2: I will make the Bavliyim descend [to Madai] in the boats in which they used to sing.
Radak: They will flee in boats, screaming (crying). Rinasam is like "Kumi Roni va'Laylah" (Eichah 2:19).