The following links will take you to numerous useful resources.
Investment Banking Overviews
Some helpful points from CareerOverview.com
careeroverview.com/investment-banking-careers.html
Lifesyle descriptions, compensation figures, and more (free account required)
princetonreview.com/cte/profiles/dayInLife.asp?careerID=84
U.S. News' discussion of one of its picks for the 2008 Best Careers list
usnews.com/articles/business/best-careers/2007/12/19/investment-banker-executive-summary.html
Important News
Interview Prep
investmentbankinginterviewprep.blogspot.com
library.cornell.edu/johnson/library/faq/bullseye_ibanking_faq.html
Blogs
lifeofasummerintern.blogspot.com
ibdwestcoastintern.blogspot.com
tradersnarrative.com/list-of-proprietary-trading-firms-735.html
Others
thomsonreuters.com/business_units/financial