Search: DuckDuckGo works well, only occasionally do I revert to Google for general searches.

Image search: ? Devilfinder can be useful, sometimes, but mostly gives NSFW results.

Voice: ? Voxox is such a bloated piece of software, but also offers Fax (when will it die? please?)

Mail: oh there are plenty of alternatives, none half as good. Then again, I'm a proud mutt user ;)

Calendar: Airset? Nah, only desktop apps compare.

Reader: I guess I'll go back to my Sage Firefox plugin.

Browser: Opera or Firefox. But to run Webkit on Linux what? Midori? that crashes every other page load.