it looks like it will be solid white with black outline, but when you put it on top of another layer in gimp, the white is actually transparent (no white color):
so, if we want the text to be white with a black outline, then click the text tool (A) and select the color black, then type in your text, as shown in the above image.
click the "select by color" tool:
click anywhere in the text layer (except, of course on the black text):
now everything but the black text is selected.
now click the "bucket fill tool" and select the color white:
hold in the shift key and select anywhere in the text layer (except, of course on the black text):
now click the "fuzzy select" tool:
and click somewhere in the white in the text layer, outside of the letters:
press the delete key. now your text is filled with white:
finished product: http://www.flickr.com/photos/nickleus/7667773196/in/photostream