For a while someone/group was doing an DDOS attack on Berlios; no idea if this is still the case.
Yes, that's one of the main problems, which caused a lot of out-times in the past. BerliOS has less resources and is thus more vulnerable to such things than other, bigger, services.
Now think about it, who would do such a thing... unless they're complete retards running haphazard attacks, it must be someone having a benefit from BerliOS not working and users being disgruntled.
To me that is even more reason to stay with BerliOS, as I'm not willing to affirm those people in what they do.
