I am a big fan of the original Founders at Work book (I reviewed it here previously), and now it seems that a European variant has been published:

European Founders at Work

I am really looking forward to reading this one, as there are some interesting companies listing in the table of contents from the Amazon page:

       1. MessageLabs
       2. Shazam
       3. XING
       4. Business Objects
       5. TweetDeck
       6. Balsamiq
       7. Dailymotion
       8. Moo.com
       9. amiando
      10. Prezi
      11. Video Island (LOVEFiLM)
      12. The Next Web
      13. Seedcamp
      14. Yandex
      15. Last.fm
      16. Startupbootcamp
      17. Fon
      18. lastminute.com
      19. Seesmic and LeWeb
      20. SoundCloud

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Updated 2022 : note that the above post was originally published in 2012, but is left here for archival purposes. I have fixed some broken links above.