Currently Being ModeratedMay 8, 2012 3:14 AM (in response to shiva_shankar307)
10.5 to 10.5.8 unfortunately you are forced to go without Java: https://discussions.apple.com/docs/DOC-3261
10.6 you need 10.6.6 for App Store, and 10.6.8 if you want Java.
10.7 you need to either install on a drive without an operating system, or one with 10.6.6 or later.
10.7 has no Rosetta.
https://discussions.apple.com/docs/DOC-2465 explains other 10.7 limitations.