I don't know if there's an AE7 version, but there's a free script called DuIK Tools that gives you an IK setup in AE.
... and until the end of the month, you can get the latest Adobe Production Bundle (the one that includes Premiere Pro, AE, PS, etc.) for 1/2 price with the "SWITCH" coupon code. They are targeting the sale at Final Cut Pro Users, but they don't require you to enter an FCP serial number or anything. At least that's what my nephew told me. He picked it up last month.