I have no time to write a detailed guide now but if someone (with some skills no newbie) want to try here a quick and undetailed guide:

1. Repartition your eMMC to make a partition for MeeGo. Minimun space required is 1.5GB but bigger partition is better
2. Format the new partition with EXT4 and mount it
3. Load (with offset 512) the MeeGo image within loop device and then mount it
4. Copy all files from meego image to new ext4 partition
5. Alter /etc/fstab file (on ext4 new partition) to reflect the correct boot partition
6. Load (with Nokia's flasher) the meego's kernel specifying a new kernel command line.
   The command line must be: root=/dev/mmcblk1p5 rootwait rw console=ttyO2,115200n8 console=tty0 omapfb.vram=0:2M,1:2M,2:2M mtdoops.mtddev=2
   Of course mmcblk1p5 must be modified to point to your partition

If all steps have done correctly now you are booting MeeGo from your eMMC
You can use u-boot also but this is only a quick guide and u-boot requires more steps that I have no time to explain