Greater Two-Weapon Fighting, flurry of strikes (Exotic Weapon Master, Complete Warrior), Slashing Fury (Player's Handbook II), at least +16 base attack, and a slashing double weapon with speed on both ends would give you 7 attacks (4 at full base attack minus penalties and 3 iteratives) with the primary and 5 (3 at full base attack minus penalties and 2 iteratives) attacks with your off-hand with a -9 penalty (-2 for two-weapon fighting, -2 for flurry of strikes, -5 for Slashing Fury). Add raging mongoose and you get 2 more attacks at full base attack for each end of the weapon. That means you get 16 attacks in total, with 9 of them at your full base attack bonus, in one round. This combination requires 7 feats and be attained by a human Warblade 15/Exotic Weapon Master 1 (16th level overall). You can spend the last 4 levels till 20th level getting wizard or sorcerer class levels to get wraithstrike (Spell Compendium).
Just some food for thought. I like the swordsage better than the warblade, personally, and I am about to start playing a warforged crusader of the Silver Flame for Savage Tide. It is going to be very amusing.
(Sorry I do not have page references, I do not have my books handy with me to look.)