Jose Nazario has researched and concluded that the Mumbai attacks did not have any correlated India-Pakistan Cyberwar:

Looking at the past ten days of attacks, which covers the terrible incidents in Mumbai and afterwards, we see no such evidence of attacks, both in DDoS traffic alerts and in DDoS commands in botnets. Only a handful of attacks have reached India in this time, most against consumer lines and none against government sites. No similar attacks have been detected in Pakistan in this timeframe.

This casts a further shadow over the clumsy work by the attackers with GPS, satellite phone and cell phones. It seems clear that the attackers represented a fairly low-tech, although highly trained, threat cell.

People commonly assume attacks must have some kind of special method, or sinister device, rather than just a different approach to common every-day practices. Bruce Schneier has put some comments previously made on his site into his post for today, emphasizing this point.