I thought Red Herring was Dead Herring. Back in the day (the boom) Red Herring was The online industry magazine and news source. Pre- TechCrunch, paidContent, GigaOm etc, Red Herring was a must read. Then it missed the online boat (who'd have thought) and the a-list blogs took over as the must reads. Valleywag has put the whole of Red Herring on Death watch.
But it seems that Red Herring is still (irregularly) putting out the magazine and (a little more regularly) continuing to host events. Last month in Malta Red Herring hosted a conference to announce/promote the Red Herring Top 100 Tech Startups in Europe. Among the winners - the Dusseldorf based trivago. Nice looking site with social networking, user generated content and a meta-search engine. I cannot see in my initial review what brings it ahead for the pack that includes the power houses TripAdvisor, Kayak, Virtualtourist, WAYN, Cheapflights etc. It may be enough that Howzat (investment vehicle for David Soskin and Hugo Burge) have invested in the trivago.
Les Explorers blog has an interview with trivago's head of PR Ulrike Pithan that has some good background on the company.
TVTrip (hotel video guides) also had a mentioned as a finalist.