Was having a play with the Windows 7 Open Search Provider. I’ve knocked one together for twitter, it’s only a ‘general term’ search, might have a look at hooking other search types into it, but that’s for later.
If you want it, just download it and either open from the download or double click it and Windows 7 will ask permission to add the search provider.
Any issues let me know. (oh you might have to right click and save as the file and make sure the file extension is osdx)