Grabbed the newly released Mint 7 and went to install it via mint4win on my Windows 7 RC laptop. The download and install went fine, but upon reboot it just booted right into Win7. No bootloader at all.
I installed EasyBCD and it confirmed that mint4win didn't even create an entry for Mint in the bootloader.
Now I remember this being an issue awhile back and you had to disable UAC and run mint4win as an Administrator to get it to work, but I did all that (had UAC disabled anyway) and still no go.
I remember somebody using EasyBCD to manually enter the Mint bootloader entry.