Alternative search engines driving traffic

[SensoVision]

Nowadays many sites get major traffic from Google, Yahoo(and engines which use their database like AWB, AltaVista, etc.) and MSN but there are other smaller engines which also drive some amount of traffic to sites, and I'd like to support them with this thread and find out which ones are working for other people.

Few months ago I've spot in my stat this engine: http://www.sitidi.net it seems to request 5EUR for inclusion but it really work at least for my directory, drawback is that they only accept top level domains... maybe that's why I only see my directory listed there and WKey doesn't appear in listing... BTW I never submitted to it from what I remember it just found me somehow.

http://www.ask.com/ - it never liked to crawl or bring visitors to any of my sites but after installing XML sitemaps and declaring them in robots.txt I've finally manage to grab it's attention, it bring only 5 visitors this month but it's ok for the start, as previously I never seen visitors from it at all.
http://www.excite.com - have see traffic from it each month and lately it start growing a bit.
http://www.alexa.com/ - one month it works and other don't.
EntireWeb and engine which use it's data http://www.ixquick.com/ also start to bring visitors lately.



There are number of other engines but most of them are meta search ones which use databases of major players, so I didn't count them.

Looking forward to hear what engines are working for you.

[SensoVision]

And here one more engine which was able to hide from me for few months AWStats doesn't recognize it as search engines but show it in referrer sites statistic instead.
It sends around 10 visitors per month but I think that with time when more people start to use it may send more...
http://www.exalead.com
BTW it generate and show nice previews of each site. For now I've added it to Firefox searchbox to try out how relevant results it may deliver.