Bing actually
is a good service. It's nothing like Live search previously, and they really worked to make it good. And this against the fact that Google has access to great amount of usage statistics. Search engines isn't about just algorithm - it's mostly about using data against those algorithms. And when you have a monopoly in search, you have access to much more data than your competitors, ultimately requiring them to spend much more effort, money and power to compete than the position you are in. This is also why Google collects so much data, from the links you choose in search results. If you've done your research, you notice they use javascript to show the real url in your status bar, but the links still go via Google
or do a request in the background to log that info. It helps them collect that info and it makes them have a major power over their competitors.
Now, Bing and Microsoft actually went out and started fighting them, from a seriously underpowered position. And it's great they do, because otherwise Google would be the only search provider in the western world.
This is also the reason why Google is struggling in non-western world like China and Russia. They didn't get there by the time internet got wider usage, so they cannot get market share now.
Firefox with Google as default is a "join project" too. Mozilla depends on almost completely on revenue coming from Google. And unlike Slashdotters think, it's not a "here, take some money and make a great open source browser!". Firefox has (or, had) the market share required and Google wanted to be the default engine so they get users. And they pay a share of revenue generated by those Firefox. Just like Ubuntu, Fedora and other free Linux distros to generate their revenue. Not that's there's anything wrong with that, but usually Slashdotters try to somehow glorify Google. It's business as usual.
Personally, I use
StartPage / IXQUICK because it's European and values my privacy more.