New in SVN trunk and soon to be released with 1.1.2: more search engines!
Until now there was only Feedster, which I admit was pretty lame. So I extended the "Search" menu with options to create search feeds for:
Google Blog Search
For now these are the engines that I found to support search feeds. The quality may differ, but it is a nice way to stay up-to-date with certain interesting topics. If the search term is unique enough such search feeds can be really helpful. But be warned for more common terms like "Linux" they are pretty useless. More reason for choosing a unique program name :-)