I heard the interface used by search engines is standard, and i heard Slang could think about realization if there will be a demand.
The demand DOES exist. Guys & girls, please support me. Slang, please, please!
There are a lot of search tools,
http://www.kalio.info/Desktop_Search_Comparison/ It is a trend and the future.
Humble i use Google Desktop Search - it is the second useful program after Ecco for me. Now i never remember where my files are stored, i'm totally relaxed and rely on mental keywords. It seems me very intelligent, it monitors changes of folders tree, it is the fastest way to find any file \ email. The enterprise version (freeware as well) select files by type, can search through Lotus Notes (which is *amazing*), through Life, the Universe, and Everything, apart from... Ecco.