The absolute best coffee tasting course going at the moment, IMHO, is Saturday mornings, 10am at Brother Baba Budan in Little Bourke Street. Its not so much a course, its just a cupping; ie. a tasting of coffee using the methodology that roasters use to evaluate coffee for roasting or purchasing. It lasts about 1/2hr to an hour and there is no cost, though they always put a lot of effort into preparing for it, so its pretty poor form, IMHO, to turn up without buying anything or at least chucking some cash into the tip jar. There is usually a lineup of about eight different coffees that is always changing and always interesting; theres often some excellent and unique coffee that you basically wont be able to taste anywhere else, along with some solid and less unusual coffee and the odd defective cup thrown in to keep us all on our toes. If you turn up to a few of these in a row, you will build up a coffee palate in no time.