The ABS and dash light issue seem to be a loose ground wire kind of thing. Have you reviewed the service records to see if and where someone may have been poking around under the dash.
You may have several issues though. FIRST (and I'm suprised no one mentioned this) you may have an internally shorted battery. Although normally internally shorted batteries would discharge faster than yours is indicating. I'd rule out the battery because you can get this done for free at your nearest Sears (Kmart now?
).
Once you have determined the battery is good, THEN I would follow the above good suggestions. Remove each fuse one at a time and check to see if your indicated current flow from the meter drops significantly.
Sometimes we car buffs ignore the obvious or easiest solution and start beating our heads to find the answers.