Technically I've spent about $45 at the App Store ($10 of which was for the iPhone update), but I actually paid $47 to get a $100 iTunes code.
Boy, those little numbers sure add up.
Ok, so I took the time to tot up exactly how much I've spent since the store launched, and for people interested:
Asphalt 4: Elite Racing: £5.99
Banner: £0.59
Beejive: £9.49
Bejeweled 2: £4.99
Biiball 3D: £0.59
Data Case: £3.99
Dictaphone: £0.59
Dizzy Bee: £1.79
Endless Walls: £0.59 (in Sale)
Face Melter: £1.79
Five Dice: £2.39
Flipbook: £5.99
Jaddu VNC: £14.99
Koi Pond: £0.59
Linguo: £1.79
Lumen: £2.39
Meta Squares: £1.79
Mobile Chat £1.79 (successfully refunded)
Trism: £1.79
£62.12 - Wowzah.
R-Fly
Over $200 easily. No joke.
Myweather
City Transit
Comic Touch
Kineo
Bugdom 2
Reign of Swords
SoD
Dizzy bee
Expando
Bejewled 2
Galcon
Funky Punch
Billy Frontier
Aqua Forest
Garf
Monkey Ball
Chopper
Line Rider
Circulate P.
2 Across
Asphalt 4
FiredropDLX
Hanoi Plus
Newtonica
Golden Skull
Enigmo
Crash Kart
De Blob
Critter Crunch
Koi Pond
Lumen
Cro-Mag
Radius
Solar Quest
Spore
TanZen
Tetris
Tiny Violin
Toy Bot Trism
vay
300 Bowl
Removem
Not to mention all the free apps I have.