Previously I mentioned frying a 16G SDHC card - since it was a Transcend, it had a lifetime replacement warrantee - so I got a new one to use, then they replaced the broken one - I threw USGS quads for most of New England on it, just to have handy in my pocket :-) xzgv is an acceptable TIFF-viewer (even used it to plan a trip to northern NH that I haven't taken yet) but what I should do instead is a local install of OpenLayers and store carved up tiles, instead of the maps themselves. (One of my coworkers is hacking on something like this, and I plan to borrow their work once they figure it out :-)