In reply to graham F:
For the Swiss online maps whose links have been given, you only get detail equivalent to the 1:50,000 paper maps you can buy, and not down to 1:25,000. For example the contour lines on-line are every 20m, not every 10m.
Edit...now I've realised this isn't entirely true. At some intermediate zoom settings you do see 10m contours, but at the highest zoom it's only 20m. I haven't tried printing out a 1:25,000 scale version from the site lately, though.
Post edited at 10:51