Hi,
the OSX Lion is out ... on July 20th
I can confirm you can upgrade Snow Leopard from 10.6.6-10.6.8 version to 10.7 easily ...

Steps

1) Download OSX Lion 10.7 (11A511 = retail version) find it on the net ....
2) Unpack installESD.dmg -> there are a lot of guides on net
3) Create a bootable USB pen with OSX Lion+Chameleon 2.0 RC5 - 755+ OSinstall.mpkg patched for MBR + some Kexts (fakesmc.kext , NullCPUpowermanager.kext)
4) Boot USB pen and install over SL
5) Start with USB pen and install Chameleon on partition
6) Install Kexts on S/L/E
7) Reboot

Enjoy

PippoX0

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iMac: Mac OSX Leopard 10.5.6 (iDeneb v1.4) - CPU: Intel Core 2 Duo E4400 @ 2.0Ghz - MB: ECS P4M890T-M2 - RAM: 2Gb DDR2 800Mhz - Ethernet: RTL8139 - Audio: Realtek ALC662 - Video: nVidia Geforce 7300 512Mb - HDD: 320Gb SATA2 - DVD-RW: SONY DVD RW AW-G170A