You may have opted-in to view the new My eBay format.  And you may have quickly opted out.  The new layout has some big changes.  Some are easy to get used to, and some many buyers and sellers have been sounding-off about on eBay forums.  eBay took some of those suggestions to make further modifications to the "new" My eBay.
 
eBay has announced that as of January 20, 2009, the old My eBay will be retired.  So, give the new My eBay a try by clicking the "try the beta" link in the upper right corner of your old My eBay page.
 
Here is the original announcement:

Hi everyone...This is Renée from the My eBay team. For the last few months, our Community has helped us test the new My eBay. Along the way, you’ve also had some good ideas -- in fact, much of what members have told us has inspired the many improvements we’ve made. There are too many to share here, so to learn more please read this discussion on our My eBay forum.

With product changes and testing behind us, we’re ready to retire the old My eBay on January 20, 2009. More than 90% of eBay members currently use the new My eBay already, but if you are one of the remaining 10% who have not made the switch, we encourage you to give it a try in the next several weeks: Just click the "try the beta" link in the upper right corner on the old My eBay pages.

I’ll update you one more time when we’re about retire the old version, but don’t wait until then to try the new experience – go try it now!

On behalf of the whole My eBay team, thanks again for your help and participation.

Sincerely,

Renée VonBergen
My eBay Product team

http://www2.ebay.com/aw/core/200811201412462.html