The Geometry of Owhango style of cache is a suggestion I'll put forward for others to consider. It provides a bit more difficulty plus forces the hunter to check out at least a few other "interesting" locations first. Probably well suited to urban locations that might otherwise be a little be a little boring if it was just a "go to point X" style of cache.
One thing I'm not sure about though is how this kind of cache works out with non etrex (Garmin?) units. Seems like some might not give distance with any degree of accuracy unless you are really close to the reference point. Even my etrex starts rounding distances rather sooner than I would like.
Anyway, in general I like the idea of a cache that requires some novel use of the GPSR or has some challenging navigational aspect.
I totally agree with the earlier replies (made some time ago!) by Gav and Donovan about the journey being perhaps more important than the search at the end. I guess I just want to play with my GPSR! Searching for a well hidden cache after arriving at the location is fun up to a point, but possibly discouraging if you can't find it or that is the main difficulty.
I well remember my first hunt which was a failure because the cache had been plundered as it turned out. Of course we didn't know that at the time and spent a very frustrating time mucking through rotting wet foliage, etc., determined to find something...
[This message was edited by evilC on May 09, 2002 at 04:07 AM.]