Good, solid analysis and summary - as good as it can get from early accounts - by Bill Roggio at The Long War Journal - Analysis: Mumbai Attack Differs from Past Terror Strikes.
... The Mumbai attack is unique from past terror strikes carried out by Islamic terrorists. Instead of one or more bombings at distinct sites, the Mumbai attackers struck throughout the city using military tactics. Instead of one or more bombings carried out over a short period of time, Mumbai is entering its third day of crisis.
An attack of this nature cannot be thrown together overnight. It requires planned, scouting, financing, training, and a support network to aid the fighters. Initial reports indicate the attacks originated from Pakistan, the hub of jihadi activity in South Asia. Few local terror groups have the capacity to pull off an attack such as this...
Much more at The Long War Journal.