Cuil looks pretty bad UI-wise. UI elements are presented in the same style as content text, which makes quick skimming difficult. A one-column layout turns into a two-column layout without any visible logical separation and no warning.
The no-warning column change also confuses the user the third column - which is consistent. I look at that page and my brain hurts.
Compare with Duck Duck Go, where UI elements are immediately obvious, and the text doesn't switch layout/flow on you half way down the page.
Also, DDG doesn't steal a bunch of pixels from your browser window permanently - not sure why this still exists in 2010.
http://duckduckgo.com/?v=c&q=hamburger
That said, the cuil results look pretty good as well.
http://www.cuil.com/search?q=hamburger
The timeline is a nice idea, tho it does seem a little bit lacking in detail.