I been playing around with some builds for this, not fully optimised but here your are, maybe they will help -
Bladesinger Blaster (AsoC): AB 37 (38 with haste, wont miss an RTA), 5 attacks, AC53 (without CE activated), Insight damage (+15 2h dmg when you do melee), depending on spell selection blast away for around 3500hp worth of spell damage, then Tenser (+8ab) + Stone Body for when you run out of spells (Or find a place to rest).
Bladesinger Melee (STR): 1 less AC (still good AC for 2-hander), but much better bab to use IPA with. The 30STR gives the same bonus as 30 INT/insight dmg above (+15), so need IPA to make it worthwhile (+12)
Bladesinger DC (Arch-Mage): DC31 + spell level for all spells (DC32 with Illusions + Enchantment) but with +11 ac more than most other DC casters (Without spending 3 epic feats on Auto-still).
Of course another benefit of the class is that free casting in light armour, without needing level 9 spells. So if you want a Warrior / ranger / Sneak based class with a Level 5/6/7 arcane spellbook with plenty of spells, go for it.
The Bladesinger requirements / feats are perfectly formed for use with the following:
(Note: Need +3 items and +4 Bracers to avoid dispels. Otherwise, fill your spellbook with what suits, you still have 6 attacks even with the wiz levels).
Bladesinger Precision Swashbuckler: Epic Precision means Insight damage applies even against crit immune targets (lvl 6 spellbook, CL16). Weakening Critical means the longer the fight, the less you get hit.
Bladesinger Swash / Weapon Master: No EP, but insight damage works well with WM (Crit multipler applies) (lvl 7 spellbook, CL17)
Bladesinger Swash Insightful Assassin: This is neat. Has Bluff / Feint as part of Bladesinger PrC. But, before first attack imbue sword with Avasculate, cast haste, cast Ethereal Jaunt. Then your first round flurry will be: Avasculate (half HP), 3 x 4d6 Death attacks (DC28 Stun) + Insight damage (+20, may help get over DR) + Damage roll then rest of flurry. Hips / feint after that.
Note: CL 16 is important for GMW. It doesn't dispel, and means ANY weapon can be a +4 weapon (Cold Iron, Silver, +3 Vamp etc)
Note: Need to play smart re spells. Mirror Images, Displacement, Haste, Teleports, Dimension Door, Invis, Greater Breach, Spell Mantles etc are always useful. Others depend on target (Energy Immunity, Grt Heroism, Superior Resistance, Stone Body, Avasculate, Banishment etc). Also, you can cast that Mords Scroll if you need, no UMD check required.
Note: If there is a particular spell you need through a high dispel area you could load up (Ie. 8 Protection From Evils).
Then the Lore of the class may be fun for some as well. In lore, a Bladesinger killed their own Elven Queen (Judge, jury and death), so pretty much just mark someone as enemy (even Royalty!), and go after them as a 'Good' act (Assassination). A combination of the above will make for a pretty awesome hunting pack! (Drow / deathsinger surface party anyone? Or Vice Versa? Just mark someone/faction as 'enemy' and go scout to gather intelligence).
Have Fun!
BigJ