Keep in mind that the Boot Camp partition, created by Boot Camp, is nothing, and doesn't appear as a boot option until an operating system is installed on that partition. In your case, that would be Win7. You haven't said that you have the Windows installer disk in the drive when you restart?
Do you have one of the accepted Win7 versions? (Home Premium, Professional, or Ultimate)
If you have 'worked' the partitions several times, and you still have the boot camp partition, then I would suggest that you run the Boot Camp utility, remove that partition, then run _Disk Warrior_ which will assure that you don't still have some problem with the re-joined partition. Only then, boot to OS X, run Boot Camp, create the Windows partition.
Insert your Windows install disk. Restart to the Windows installer when asked by the Boot Camp software. Try this trick as the Mac restarts - Hold the letter C on your keyboard. That will try to force your Mac to boot to a disk in the optical drive (the Win7 installer)
If you don't get any further with that installer CD, you should try booting a different computer to that CD, might not be a good disk...
Serendipity is a lucky guess !