I've been using Safari 4 for a week or so. It was only today that I realized that I couldn't actually change the default search engine within Safari. Ugh!
Thankfully, there's Glims, an application that allows you to manage your search engines in Safari. You can add, remove, edit and customize the search engines of your choice. It's incredibly simple to install and configure.
Simply install the plugin, restart Safari, and open Safari > Preferences. On the last tab you'll find the settings for Glims.
Bing wasn't on the default list, but I was able to add it in a few minutes with the following path setting:
Since most content management systems come with internal search capabilities, you can also add your own site. I find myself searching my own site quite often for old posts that I've written. The fact is that my blog has a much better memory than I do!
Here's my blog's search settings (consistent across all WordPress installations):
If you're frustrated with Safari's default search being locked in with Google, install Glims. If you really wish to cross the streams and irritate the heck out of Steve Jobs, set your default search engine to Bing. [Evil laugh]
I'm enjoying Safari's latest release and enjoying Bing (especially the image and video search methodologies). This wraps both of them into a great package!