Ok, here is a business idea for all you people that want to make money fast: no, seriously ;)
So either you have an old installation DVD lying around somewhere, then sell it (on amazon, obviously) or you could just buy from ebay and sell on amazon. I am too lazy to do it, just wanted to provide a quick heads-up.
The Flashback Trojan for Apple's Mac OSX already infected over 600.000 Machines, according to @hexminer on twitter. There is an existing Java Security Update from Apple, all users should update immediately.
Apple is too slow in releasing security fixes - the last known security holes in Mac OSX Java took Apple over 6 months to fix.
F-Secure shows how to secure your Mac by disabling Java. Lion does not come with Java by default, although most of the times it is installed afterwards (running Java applets or Java applications, the Systems asks to install the Java package).
The Flashback Trojan hides as Adobe Flash Player, so the most secure thing to do is to remove Java and Flash from your system. Adobe Flash still does not completely work with Mac OSX Lion, bugs that were reported by Nanofunk over 6 months ago are still open.
Gizmodo posted a simple way how to test if you are infected:
Run the following command in Terminal:
defaults read /Applications/Safari.app/Contents/Info LSEnvironment
Take note of the value, DYLD_INSERT_LIBRARIES
The expected output should be:
"The domain/default pair of (/Applications/Safari.app/Contents/Info, LSEnvironment) does not exist"
Then, run this command:
defaults read ~/.MacOSX/environment DYLD_INSERT_LIBRARIES
"The domain/default pair of (/Users/joe/.MacOSX/environment, DYLD_INSERT_LIBRARIES) does not exist"
"does not exist" means you've got a healthy rig. If there is any other message, keep following F-Secure's instructions to vanquish the intruder.
[Update 2012]: using Multibeast is the preferred way to install 10.7 Lion or 10.8 Mountain Lion
see the Nanofunk Post: Booting and Installing Mac OSX 10.7 and 10.8 Mountain Lion on Hackintosh
"lion is booting with some old xpc version" ~ Netkas
Some people are claiming to boot the recent Mac OSX 10.7 Lion with the XPC Bootloader project. More and more voices are popping up, so I am just pointing in the right direction, since "Any and all information about downloading and installing Lion, as well as any details are under Non-Disclosure Agreement from Apple.". You probably find updates on Netkas' Blog as well.
UPDATE: see a posting/ short guide on a popular board as well: Mac OS X 10.7 Lion [Beta/HowTo]