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#11
This link has some info how to add Windows 7 after a Linux is already on. It seems to have 2 schemes. Either recovering grub, or using easybcd and Windows boot loader. Esp. if you want to play with custom kernels(does anyone do that anymore?) I think grub is more versatile. You can load Linux from the same partition but with various startup options such as custom kernel, or scripts that load different sets of modules etc..
Also it's possible to make the equivalent of the old Linux boot diskette using a USB. The USB mounts the Windows partition and boots it. Handy if the MBR somehow gets hosed.