Jetsetter is known for great design (see here). Here is a good example of good design and effective mobile promotion. I have written before that promoting mobile applications via the web is challenging: for instance, conversions are weak due to web to download and data is limited (device, OS, etc). SMS and email are powerful ways to promote applications because they are consumed directly on the device. Good examples by: Sparrow, Redbox, Groupon and Gilt.
Here is another good example by Jetsetter (whose parent is Gilt). Login and you get the following promotion: - awesome slogan: "travel made, travel sized" - good looking promotion - big action item of downloading the app via SMS (enter your cell number)
Much cleaner for users and more powerful for the brand.