April 1, 2004 Ultrarunners of the month for March 2004  Dave Mackey, 34, Boulder, CO has now established himself as the premier American Ultrarunner on the trails, as demonstrated at the Way Too Cool 50K Trail Run in Cool, California.  Mackey averaged 6:52 over the difficult 50 kilometer course, finishing with a great time of 3:32.  Mackey is the defending USATF 50 Mile Trail Champion, having won the White River 50 Mile Trail Championship last August in Washington State.   Beverly Anderson-Abbs, 39, Red Bluff, CA ran a remarkable double on the weekend of March 20/21.  On Saturday, Anderson-Abbs won the Rucky Chuck Roundabout Trail 50K in California in 4:49.  On Sunday morning she won the Stevens Creek Trail 50K in 5:17.  While racing twice on a weekend is not all that uncommon for shorter distance runners, ultramarathoners who undertake such a double (and win both) are rare.     Congratulations to these two outstanding performers.