What is the best way to tenderize beef, like steaks

Here is an article on various methods of tenderizing meats.
How to tenderize meat (http://www.ochef.com/358.htm)

The rest of the articles are linked below:
tenderize meat - Google Search (http://www.google.com/search?q=tenderize+meat&sourceid=ie7&rls=com.microsoft:en-US&ie=utf8&oe=utf8)

I use Italian Dressing, marinate it for at least 1 hr in the fridge, works great for chicken too.

I like to marinate steaks in diet coke. Just pour the diet coke over the streaks so they are completely covered (about a liter). This imparts no taste but really creates fork tender steaks. I like to let them marinate over night in the fridge.