There is a 70 line app on python for series 60 to display tiles from google maps. It let you move around (using cursor).Zoom in using 'select', Zoom out using star. This example demonstrates how to tile the 256x256 images to fill the screen.
Read more on the Nokia Developer Discussion Boards.
UPDATE: If your prefer using a pocket PC try Minimo 007 the Mozillia based browser. Seems to work fine as yyou can see on Rebrons Blog.
