This came out of one of Alton Brown's book. I can't remember the title, but this is hands down, for our family, the BEST marinade for all cuts of beef. This recipe makes enough for 1 to 1.5 lbs of beef.
Use as a marinade for almost all cuts of beef. The longer the meat sits in the marinade (in the frig, of course) the better. I try to let it marinate a minimum of 24 hours. For large tri-tip roasts I try for 72 hours.