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Kayak.com is a website that allows you to search for airfare and travel needs.

It has an interesting search UI.

Go ahead and do a search for a flight, and you will see that instead of the usual:

"I am searching, be back in a minute"

you get:

• I have done x out of y
• Here they are
• Feel free to stop me at any time if you have enough info
• Oh, and I am done now so here is everything

The funky changing display on the left is fun too. This is a lot nicer for me the user. I get feedback at the right time (when available), and I am engaged.