Upload & Sell: Off
The easiest way to maintain fuctionality of the EOS Utility and older bodies is to add a small Snow Leopard partition on your Lion harddrive. It's much simpler than one might think, as Disk Utility can create the partition with just a few clicks, and the older OS X install takes 15 or 20 minutes. Once that's done, boot to that new partition, install an older version of the EOS Utility, i.e. 2.8.1, and boot to that partition whenever you need to shoot tethered or use a Firewire to 1D connection.