One guy named Asif Suria from California runs and updates this website everday. This has an updated info on "insider transaction". It can be very helpful. For the last several months, most of the insider accumlation has been done by people in the banking industry and especially the smaller banks that were beaten to life support during the recession. here's an update that i received in email. Its been profitable using this free service that gives you an idea about what's goiing on around the business world. I'm sure there must be a lot many websites that provide infos like this or even more detailed info. 

Currently I'm also interested in insider buys done by people in the "lab or enviornment" industry. This industry will be responsible  for regulating oil men and oil women and from not screwing up the environment and so the oil men and women will happily do all kinds of tests or follow procedures directed by enviornmental industry. For example, water testing, oil waster removal etc etc. Going forward, this industry looks promising.
http://www.filing4.com/