Originally Posted by N.Stocks 
But with just organizing them according to date, means that you will always need to search using the search tool, as you won't be able to remember that a particular photo was taken on March 25th 2006...
Well, the by date is just for filing purposes - the physical location on disk (e.g. D:\Catalog\2009\06\03). I then keyword each photo on import (e.g. Flora, Weed, Dandelion, Roundup, Dead). And if the photo(s) are part of a group or a shoot I then put them into a collection (e.g. "Weeds I Killed").