I'm believing this with a grain of salt

[easy4lif]

http://l33ts.org/forum/Thread-Mac-OS-X-10-7-lion-for-Core-Duo-and-Core-Solo-macs-32bit

Mac OS X 10.7 lion for Core Duo and Core Solo macs 32bit
Mac OS X 10.7 Lion for Core Duo and Core Solo macs (unsupported macs)

by the Roaring Core team over at roaringcore.wordpress.com

just be sure to read the pdf and make a back up of your current OS.

Multi-touch kinda works so you would need a magic mouse or track pad to make full use of lion.

AND DO NOT UPDATE ANYTHING ON LION OR ELSE IT WILL BREAK IT!!!

Download!

any problems let me know and i will help you.

Like I said, a grain of salt

 

[claimed4all]

It has already been done. By changing a boot file you can run Lion on a 32 Bit system.