Whoa...hang on Brogrim. ZmrAbdulla is correct, you can have as many columns in the combo box visible as you'd like, once you drop down on it. Make sure you have 2 or 3 in the number of columns, the column widths are appropriately wide enough, and the size of list is big enough to accomodate the columns. If you want to show only the last two columns, in the query builder of the record source, move the first column to the end and enter "2" in the number of columns. Also, pay attention to the bound column property of the combo box, as it will affect what value you're writing to the record.
If this doesn't work, there's something else wrong. Give us more detail.
-Patrick
Nine times out of ten, the simplest solution is the best one.