I'm not going to mess around here. This could get ugly, fast!
It is very likely that your data is non-recoverable at this stage, so you will be reinstalling Leopard to get back to a working state.
Before you do that, however, you need to use the Windows disc to remove the partition that was created. To do this, pop the Windows disc into the DVD drive, Option boot to the disc, and press a key to start. When Windows Setup starts, press R to enter recovery mode.
In recovery mode, you're working with an MS-DOS-like command line. Here, type:
diskpart <Return>
Select any NTFS partitions you see, and press D, <Return>, L.
This might help got it from apple forums
Now, press ESC to exit, and type:
exit <Return>
Option boot again, and eject the Windows disc with your <Eject> key. If this fails, reboot while holding the mouse button.
Now, restore your Mac.
When you try Boot Camp again, make absolutely sure that your Windows disc has SP2 or later. Using earlier versions may have been the root cause of your trouble, as these versions do not support advanced hardware or large hard disk, as Macs have. You can apply SP2 via "slipstreaming" your own disc.
I have exactly the same problem, disk utility greys out the hdd so you cant erase. Im taking mine to apple store on saturday. Have you managed to fix yours yet.