What are the main Exegetical Midrashim?

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taken from http://www.faqs.org/faqs/judaism/FAQ/03-Torah-Halacha/section-28.html
Answer:
* Genesis Rabbah (Bereshit Rabbah). A midrash on Genesis, it offers
explanations of words and sentences and haggadic interpretations
and expositions, many of which are only loosely tied to the text.
It is often interlaced with maxims and parables. Its redactor drew
upon earlier rabbinic sources, including the Mishna, Tosefta, the
halakhic midrashim the Targums. Genesis Rabbah also apparently
drew upon a version of Talmud Yerushalmi that resembles, yet was
not identical to, the text that survived to present times. It was
redacted sometime in the early 5th century.
* Lamentations Rabbah (Eichah Rabbah). An exegetical midrash on
Eichah (Lamentations). It contains verse by verse expositions,
simple lexical explanations and also many parables and stories. It
contains many stories about the destruction of the Temple, the
crises under Trajan and Hadrian, and the Bar Kokhba revolt. It
draws upon the Mishna, Tosefta, Mekhilta, Sifra and Sifre.
Lamentations Rabbah has been transmitted in two versions. One
edition is represented by the 1st printed edition, 1519 Pesaro;
the other is the Buber edition, based on manuscript J.I.4 from the
Biblioteca Casanata in Rome. This latter version (i.e. Buber) is
quoted by the Shulkhan Aurkh, as well as medieval Jewish
authorities. It was probably redacted sometime in the 5th century.