These were created by the Denver Mint by placing an aluminum ring around a Presidential dollar. The number was limited to 1000 each for the first six Presidents, and slabbed by ANACS. It's been discussed here before, http://www.cointalk.org/t39091/
Not as much as HSN was selling them for, that's for sure, and certainly not MS66 money either, which is $13.75 according to numismedia.com. If I was interested, I wouldn't pay more than $2 for it myself.
Something like this, is really no different, save the ANACS slab and grade, then placing a U.S. coin in a bezel for mounting in a some jewelry. The aluminum ring adds nothing to the value, IMO, and that would never cross over to PCGS or NGC because of the ring on it. No doubt there were a 1000 of these made special for HSN, who retailed them for $79.95, plus $8.95 shipping. http://www.hsn.com/2007-madison-ms66-presidential-oath-dollar_p-4470614_xp.aspx As I said, these aren't worth anywhere near what HSN retailed them for.
San Francisco struck 1,272,00, compared to Philadelphia and Denver. Looks to be F-VF, numismedia.com has a value of $46-$115
Sloght correction. Despite what certain web pages state, these were NOT made by the Denver Mint. Only sold at the Mint Gift Shops which are owned and operated by non-US Mint Employees. They were made by ARAMARK outside of the mint for sale at the US Mint Gift Shops which they own and operate. These "Oath Dollars" are in no way an official US Mint Product anymore than the "Penny in a Bottle" or any of the other hundreds of products offered at that store. (Coffee Cups included!) They did have a wave of popularity until folks figured out that these are the same as those aftermarket "Good Luck" Cents which are simply pressed into an aluminum ring. The pressing can cause damage to the coin from a numismatic perspective. Since they were only "sold" at the Gift Shop(s) located outside of the Denver Mint (for $19.95 i believe), folks naturally "assumed" that they were made by the Denver Mint but they were not. See Coin World July 28th, 2008 Page 10 or PM me with an email address and I'll send you a scanned copy. Are they "collectible"? Sure. Just like any other coin encased in aluminum or perhaps tea cups and stamps. Some folks will pay a premium while others avoid them like the plague. I like them and have a couple but I won't pay a premium for them. Some dealers have some for sale that they paid a lot for on the aftermarket and they won;t sell them for less. I guess they'll have these for quite some time. I would wager to say that in open bidding, each might bring $25 - $30 on a good day.