Problem with Twitter

For more than week I am not able to use the Twitter when I am connected to internet via O2 ADSL here in Prague. I am not alone - friend of mine Mnagas has completely the same problem.
Each time I try to open the Twitter home page in a browser it ends up with the "Connection Interrupted" or "Network Timeout" error.
I spent some time investigating this issue, and found next:

• it is not a problem of DNS, domain resolves to the correct IP
• it's not a problem of my machine (friend of mine has same problem, I also verified that from other computers at home I got the same results)
• I had a chance to test O2 ADSL connection outside of Prague and there it works fine!
  
• other Twitter pages like Twitter Status, Twitter Blog work fine
• BUT pages Twitter Home or Twitter/boruvek always return the error...WTH?!
  

What shall I do? Am I only a victim of anti-spam / anti-DoS or IP-ban activity from Twitter side? I must say I am bit lost :-) What would you say? Is it a problem of O2? Twitter? :-)

I am quite annoyed. So far I found that only way people to complain about Twitter issues is the GetSatisfaction, which I think is a great support tool and idea, but I do not expect anyone to care about a n issue having single vote only (my question).

As I said I am a bit annoyed about this since I kind of started to like the twitter ;-)

The workaround I found to solve the twitter "withdrawal" is to use the TwitterGadget (Twitter widget for GMail or iGoogle) (via @janecek).

All other desktop twitter client apps (such as twhirl or similar) are facing same connection-problem as described above.