There’s a site out there called CRE Online which is a great free resource with a wealth of information at your fingertips. They provide real estate investing articles written by the most successful investors in the country.
Some of the writers on this site try to plug their books, others are just offering up free information from their past success. Either way, it’s a site worth checking out. The site is in dire need of a redesign (it’s circa 1995) but some of the content is golden.