The interesting The Prejudice Map gives an overview of what the different peoples around the world are known for... (according to Google, that is). But Czechs (and most other smaller nations) are missing. So I thought, I'd fill in the gap. The search on Google netted 97 results. Here are most of them:

• Czechs are known for their Bohemia Crystal, Garnets and costume jewelry, their composers (Antonín Dvořák, Bedřich Smetana ) and a Theater and Cartoons
• Czechs are known for having a large interest in America
• Czechs are known for their outstanding beers
• Czechs are known for having a dark sense of humour, a kind of inborn pessimism
• Like the Italians, Czechs are known for their fine tastes and craftsmanship.
• The Texas Czechs are known for their methods of cultivation
• Czechs are known for their massive consumption of two things: beer and short message services (SMS).
• Czechs are also known for their sweet tooth and make fabulous, rich desserts
• Czechs are known for the intellectual sophistication
• Dumplings, sauerkrauts and deserts are what the Czechs are known for
• Czechs are well known for their aversion to
  move from where they live just because of a job
• Czechs are not known for taking risks
• Czechs are not known for being tough or the fighting spirit
• Czechs are known for playing a dull, trapping style of hockey that allows even The most skilled opponents little room for creativity.
• Czechs' are known for making good weapons
• Today Czechs are known for their prowess
  at chess, music, and hockey
• Czechs are known for their impoliteness
  and sincerity
• Czechs are known for their love of nature
• Czechs are known for their hospitality

Some of these things were a bit surprising. Please add your views of what the Czechs are known for in the comments.

It bears remembering that these statements are taken out of context which may have modified their impact and also that the 'known for" bit is often just the speaker's way of lending a bit of authority to what they really want to say as their personal view.