Because of the global upsurge in resistance, as well as the emergence of the Occupation movement, which is directly taking on the role of banks and other corporations in the running of society, in 2012, we will be studying Marx's most important work Capital.
As this is a somewhat intimidating work, we will be following along with David Harvey's lecture series, Reading Capital, Vol. I.
While this work can be found online, in both text and audio formats, and used versions are easily available, I strongly recommend getting the most recent translation (unless you prefer to read it in the original German). This version is available from Penguin and Vintage publishers. It has an introduction by Ernest Mandel and is translated by Ben Fowkes. The translation is updated to deal with changes in the language since it was first translated in 1888. In addition, David Harvey uses this version, so when he mentions page numbers, it will match up to the book.
I strongly recommend getting a notebook and taking notes and writing down questions to bring them to the study group. Highlight or underline passages from the book you think are significant, write notes in the margins, and summarize each section in your notes in your own words. Use different color inks when quoting in your notes, etc.
Feel free to look to addition sources and books to help you understand this text.