SCOTUS blog discusses "the five petitions that the Justices will consider Nov. 10, the issues each seeks to raise, the lower court involved, and the petitioners".
Here are a couple of quick useful summaries of the relevant issues, including the individual mandate, severability, Medicaid burden on states, etc.:
"Obama healthcare law issues before high court", Vicini, Reuters, 10/25/2011.
"High court zeroes in on health care", Haberkorn, Politico, 10/23/2011.