Computerworld has a great tutorial on how to build your own bootable installation/recovery DVD or flash drive for Mac OS X 10.7 (Lion) You should read the whole thing, but here's the meat: Step 1 (for all types of media) 1. Once you've purchased Lion, find the Lion installer on your Mac. It's called Install Mac OS X Lion.app and it should have been downloaded to /Applications. 2. Right-click (or Control+click) the installer, and choose Show Package Contents from the resulting contextual menu. 3. In the folder that appears, open Contents, then open Shared Support; you'll see a disk-image file called InstallESD.dmg. 4. Launch Disk Utility (in /Applications/Utilities). 5. Drag the InstallESD.dmg disk image into Disk Utility's left-hand sidebar. The next steps depend on whether you want to create a bootable hard drive or flash drive, or a bootable DVD. Step 2a (to create a bootable flash drive): 1. In Disk Utility, select InstallESD.dmg in the sidebar, then click the Restore button in the main part of the window. 2. Drag the InstallESD.dmg icon into the Source field on the right. 3. Connect to your Mac the hard drive or flash drive you want to use for your bootable Lion installer. 4. In Disk Utility, find this destination drive in the sidebar and then drag it into the Destination field on the right. Warning: The next step will erase the destination drive, so make sure it doesn't contain any valuable data. 5. Click Restore and, if prompted, enter an admin-level username and password. Step 2b (to create a bootable DVD): 1. In Disk Utility, select InstallESD.dmg in the sidebar 2. Click the Burn button in the toolbar. 3. When prompted, insert a blank DVD (a single-layer disc should work, although you can use a dual-layer disc instead), choose your burn options, and click Burn.