Apart from the iMapBC and GeoGratis sites for 1:50000 and BC TRIM 1:20000 topos, Geokov.com also has them along with Google maps/3D Earth. (http://geokov.com)
Once you are in a subregion page, from the top of Google maps you can choose from standard Google maps (terrain, satellite, etc.), Canada 1:50k, BC 1:20k and Google Earth 3D in your browser (need to download GE plugin). Can overlay lat/lon gridlines as well as UTM grids, however UTM look better in Google Earth since you see the numbers.
There are quite a few trails and links to conditions (and info exchange) and functionality for plotting a route on map as well.
For printing, the page where you can plot your route provides a larger map (but will be without the trails).
