Interesting challenger to Atomz.com and the first wave of now dead search-as-a-service players like SearchButton.com. The ability to push content into the index on demand is a nice feature.

Does atomz.com work? I tried it and it times out. Hadn't seen it, thanks for the tip!

I have not directly - they were the enemy as I was a search guy over at Searchbutton. Freefind is another very light SAAS site search solution. If you are interested in the space Searchblox is an open source search platform based on Lucene that can be had for free and deployed easily on EC2. Also take a look at the newcomer Constellio.