Craigslist, HN. Still good–old, fast and extremely useful.
Most newer crap–web has more bugs than features and nearly defunct after all. My opinion is that in this stupid century of hype, ADD, dyslexia and internal censorship immutability is the most precious asset. And swisswatch-like software can be the next big thing.
PS. Booking.com is also cool. BTW, it is still powered by Perl.