A great thing about the internets is how easy its made specialist nature networks - in this case, the Butterfly Conservation Trust - to enlist public help in nation-wide surveys. The Big Butterfly Count has to be one of the best recent uses of technology, with a simple ID chart, an easy count, instant results, and the ability to see your & neighbouring results on a googlemap. Even 10 years ago this would have been nowhere near as succesful.
Also, you should go out this week and count butterflies!