PubSub. Welcome to PubSub. I'm really liking this. Pubsub matches your requests/interests against new information as it appears in real time. It tracks over 8 million sources on your behalf. You can create very simple searches - just a word or two in fact (though oddly it defaults to OR rather than AND), but it does have excellent Boolean capability, including nested logic. You can also limit searches to various fields, such as your keywords in the title. You can also limit to press releases, SEC/EDGAR filings, newsgroup posts and, strangely enough, airport delays and earthquakes.

Results can be returned to you in a variety of ways; if you wish, you can just go back to the site, which remembers who you are, or you can download a sidebar for IE or Firefox for example.

It's completely free and you don't even have to register to use it. [Phil Bradley's Blog]
12:30:38 PM    

Brainboost Answer Engine. Brainboost is a natural language search engine - just type in your question and see what you get. Overall, I was pretty impressed, and I asked it some difficult questions, which it managed fairly well, such as:
What is the population of London? (Though it assumed I meant London UK, not London in Canada)
Where is London? (Gave me various good answers, mixed in with a few locations of hotels in London)
Why did the South lose the Civil War? (Wasn't too hot on that one, but linked accurately to websites)
Who is Phil Bradley? (Pulled the answer straight from DMOZ)
What's the best search engine (That one did confuse it rather a lot)
Is Google better than Yahoo? (Wasn't too bad on this one).

Definately worth trying out. [Phil Bradley's Blog]
12:30:16 PM