Lion/iCloud installation on multiple devices.

I purchased Lion a few days ago on my iMac so that I could use icloud instead of MobileMe. I now have got around to linking my devices and I cannot get my Macbook air to show iCloud (or Lion). I tried to use EasySuite to take it across but of course it longer supported. Does this mean that I have to buy Lion again? I am getting fed up with having to re-purchase software every time there is a 'change'. I also have an iPhone 4, an iPad 2, and a few iPods including a touch.
Thanks
Cerasina

Login to the app store on your macbook air, and it should be under "Purchases". You can re-download it and install it. According to the App store's EULA "on any computer you own or control" in your household.

Thanks Mike, but it won't let me click on it. I can click on the other purchases but not on the OS X Lion which appears to be 'unclickable'. I thought it might be something to do with needing an update but it tells me that everything is up to date. However since I did all the upgrades on the Macbook Air, 'purchased' and 'purchased on iPad' are no longer on the left hand panel of iTunes. They are there on my iMac.

Try holding down option and clicking on it.

Re-Download Mac OS X Lion from the App Store

The option didn't work but I went through the website you gave me and managed to get Lion installed. It took a while but is now working beautifully. Thank you for you help.