. . . currently HomeAway.
We don't say something like this lightly. But today's news that it has invested yet more money in the European holiday rental marketplace is significant.
After securing a mammoth $250 million worth of funding last November, eyes have started to open to the rentals market from other parts of the industry.
HomeAways's acquisition of continental player Homelidays for an undisclosed fee, was at to least one of its rivals in the European marketplace a bit of a shock.
"We weren't expecting them to start spending the money so quickly," our rabbit caught in the headlights admitted to us yesterday afternoon.
But for some people the reason for the outlay is blindingly obvious: online holiday rentals is a burgeoning sector, made up of hundreds of small and low-profile portals and individual landlords, therefore ripe for large firms like HomeAway to start that large-scale aggregation which has featured so prominently (and successfully) in hotels and air fares.
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For a company like HomeAway, snapping up businesses around the US and latterly in Europe makes sense as it attempts to increase scale and cross-fertilise properties across its portfolio of businesses.
As we pointed out last November, the triple-figure funding round HomeAway received was probably the biggest single piece of investment in the travel space from private equity since those of the old GDSs - Travelport and Sabre - in 2006.
This, in itself, speaks volumes about where the big boys of the investment world think the biggest return is going to come (with all due respect, of course, to the trip planning sites like Tripwolf and Uptake, which have secured more capital in recent months).
However, similarly to when the online travel agency model revolutionised distribution of hotel and air deals on the web in the late 1990s and early-2000s, the little guy is getting worried.
Within hours of our story running yesterday, responses started coming in from Twitter.
Indeed, some small, independent aggregators are not entirely enamoured with the Homelidays purchase.
"Pure cannibalism" said one comment. Another simply muttered: "Big isn't beautiful." "Not good news!!"
One more: "As long as 'some' still challenge HomeAway there is hope for creativity in our industry."
The LayMyHat forums carried similar themes.
Not exactly a positive reaction, then.
The boss of another online rental firm said last night the latest move and the growing dominance of HomeAway would be "bleak" for the sector.
"They will control the future of our industry in terms of design, technology and usability," the email claimed.
This will impact on the owners and customers in several ways, the email continued, but primarily because the standardisation of the platform and design makes it harder to distinguish between properties and large resorts, alongside the theory that the user experience is diminished when they are literally hundreds of thousands of listings.
Now some might see this as simply sour grapes from someone who didn't trouser $250 million last year.
But these are the voices of people that see huge change happening in their, until now, relatively peaceful and low-profile part of the travel industry.
As other parts of the industry have discovered, events can take place which shape - sometimes driven by just one or two organisations (think Ryanair-easyJet) - an entire area of the business forever.
We certainly think that HomeAway is driving much of the change in the holiday rentals space at a structural level - for good or bad is something for you to decide at this stage.
But this hopefully explains our assertion that the company is currently the most interesting in online travel.
And this is why we have invited Brian Sharples, co-founder and chief executive of HomeAway, to speak and then be interrogated at the Travolution Summit on April 21.
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More content from the Travolution team, including random commentary, interesting stuff we've seen elsewhere and our usual sideways look at the travel industry.