“We run the iPhone and iPad teams separately from the Web team, and the Web team had fallen behind,” said Paul English, co-founder and CTO.

The goal with the site’s design has always been to provide a simple layout, so that users can easily sift through thousands of flights, hotels and car rentals to find what they are looking for quickly.

But up until now, the focus wasn’t really on being beautiful, English said. The new look tries to incorporate a clean and attractive design.

After eight years in business, English said this is the most significant redesign of the site (check out the gallery below to see how the site has changed over the years). But only the most die-hard users are likely to notice many differences. Rather, the larger significance is that mobile is influencing the Web, and not the other way around.

Increasingly, this may be the case in the travel industry as so much of the traffic now comes from phones and tablets. Kayak said more than five million applications were downloaded in the nine months ended in September, a 97 percent increase over the same period a year earlier.

In early testing, English said conversion rates are higher and completion times are shorter as a result of incorporating mobile designs — which, by nature, are always built with speed and ease-of-use in mind. “They [customers] are more confident to compete the purchase because we haven’t worn them out.”

View the slideshow

Here’s some of the more notable changes:

The unibrow is gone: Internally, the company refers to “the unibrow” as the black bar that stretched across the the top of the page that said “Search One and Done.” Now at the top of the screen are several tabs, such as Flights, Hotels, Cars, etc.

Similar to iOS: The iPhone and iPad designers released a new iPad app about a month ago. In the new Web site design, they leaned on the design to bring a consistent typeface and coloring to the Web site.

Fewer ads on the site: When users are looking at photos of a hotel or viewing a map, they won’t see any ads. “Obviously, ads are an important part of the way we make money, but advertisers have gotten clever, and sometimes the ad is jarring and has animation,” English said. Kayak is issuing all-new guidelines that requires advertisements to blend with the site. “If you do a good job, it should be content. If we are showing you ads that are extremely related to what you are doing, it’s useful.”

Most of the changes will go live today, with some of the others — like the new ad guidelines — taking more time to implement.

English declined to provide an update on the company’s IPO. While it continues to file financial updates with the Securities and Exchange Commission, Kayak told AllThingsD in September that it was putting its plans on hold.

Earlier this morning, Zynga announced it would price its stock between $8.50 and $10 a share when it goes public later this month.

That’s at the high end of the range that values the four-year-old company at as much as $7 billion. But that’s much lower than than what some investors paid as recently as February, according to documents filed with the Securities & Exchange Commission.

In fact, some of its investors are already underwater.

One of those investors is Morgan Stanley, which is also one of the company’s underwriters in its IPO. In February, 11 mutual funds associated with Morgan Stanley purchased 5.3 million shares at $14 apiece for a total of $75 million. Four other investors, which were unnamed, also contributed to the round totaling $490 million, according to the document.

At $14 a share, the company’s value in February totaled nearly $10 billion, or roughly 43 percent greater than today’s high-end of the range.

Zynga justified the higher stock price back in February, stating that the U.S. economy had improved and that the public markets were being receptive to Internet stocks, including generous valuations for privately held companies such as Facebook and Groupon.

Furthermore, in March, the company used that valuation as a guide to purchase shares back from five of its early investors and its CEO Mark Pincus at $13.96 a share.

While the market conditions have likely changed since then, it’s important to note that things are still in flux. If the company drums up enough demand for the 115 million shares being sold over the next two weeks, the price could move even higher.

As Kara Swisher previously reported, Pincus will not sell any shares in the offering, and no other executives at Zynga have plans to sell stock, either.

But a number of the company’s early investors will be cashing in. Institutional Venture Partners, Avalon Ventures and Foundry Venture Capital will sell 2.5 million shares apiece for up to $25 million each. Union Square Ventures will sell 2.2 million for roughly $22 million.  Google and Silver Lake Partners will also both sell 1.7 million shares for a proceed of $17 million each.

Google was originally not listed as an investor when Zynga filed documents with the SEC to go public, but it showed up in subsequent filings. Google, which was rumored to have invested as much as $100 million in Zynga, has an interest in social gaming because of its Google+ network. Following the offering, it will continue to own 21 million shares, or about 3.8 percent of the company.

One notable shareholder that won’t be selling shares is venture capital firm Kleiner Perkins Caufield & Byers, an early investor in the company. Its partner Bing Gordon, who personally owns a 10.7 percent stake in the company, also does not plan to sell any shares.

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